CN2485734Y - Page turning and drawer style demonstrator for electrostatic field and potential - Google Patents

Abstract

The utility model relates to an electric demonstration instrument, in particular to a page turning type and a drawer type structure electrostatic field electric potential demonstration instrument, the drawer type structure consists of a nixie tube heading(1), two spy bells(3 and 4), four page turning type electric field plates(5, 91, 14 and 19) and an L shape metal plate(27) so as to form a cabinet type structure to be arranged in a carrying case body(29), wherein, components, laboratory items and case body are joined with one another, forming a simple, light and beautiful whole. Dialing through a 4.5 V and a 1.5 V battery power switch(28), within a plurality of minutes, the utility model is capable of quickly, digitally, intuitively, accurately, steadily and easily demonstrating fourteen demonstrating experiment such as the positive and negative valves of the electric potential of the electrostatic field and the rule of the electric potential, etc.

Description

" pivoted ", " drawer type " structural type electrostatic field electromotive force demonstrator

The utility model belongs to the physics teaching demonstrator particularly can be fast, numeral, ocular demonstration electrostatic field electromotive force, many rule of the size of this extremely important physical quantity and potential value.

Potential in static Electric Field is one of the most basic notion of physics, electromagnetics, electronics etc., is the emphasis notion, but very abstract, is one of difficult point content of giving prominence to, so the student is when learning, the special sensor difficulty.

The utility model when discussing the electromotive force notion, is a theoretical definition electromotive force notion before the applying date in " physics " textbook content, in order to allow the student further understand, always enumerates the understanding of teaching students of some examples with analogy method; Experimentally, though the experiment of " describing equipotential line " is arranged, but used experiment equipment is experiment equipments such as conductive paper, galvanometer, probe, describe equipotential line with these experiment equipments, can only demonstrate qualitatively, but can not really allow the student see in the electric field quantitatively, the existence of certain some potential value and its size, the teacher more can not with the experiment of this cover fast, numeral, directly perceived, accurately, stable, the size of demonstration potential value, positive and negative in the classroom, so the student always feels difficulty.

The purpose of this utility model, at above-mentioned situation, law of cognition according to the people, always from feeling rational, from specific to abstract, therefore, the development electricity, use the charactron display technique, fast, intuitively, numeral, accurately, stable, the size and just of each point potential value in the demonstration electric field, negative value, make student's visual sense each point in the electric field exist electromotive force really, and have the size and just, negative value, make abstract electromotive force reification, visualize, digitizing, change and embarrass easily, the innovative teaching means, improve teaching efficiency, improve the quality of teaching the utility model, in design, in the design, be " pivoted ", " drawer type " structural type electrostatic field electromotive force demonstrator can be demonstrated 14 lecture experiments, the experiment structure and the experiment equipment of 14 lecture experiments, Highgrade integration is within the casing of a portable case type, the experiment structure and the experiment equipment of 14 lecture experiments divide apparatus for converting on as four electric boards that turn over " page ", press the lecture experiment needs, need what experiment of demonstration, with regard to the experiment structure of handle assembly on which piece electric board, experiment equipment is opened as turning over " page ", does lecture experiment.

Very clear in order to allow each lecture experiment all allow observation of students get, to demonstrate before four electric boards are extracted into cabinet door as " drawer ", but do not drop out, demonstration finishes, and pushes in as pushing away " drawer " again, closes upper chamber door, portable light carrying.The utility model demonstration electric field potential value and potential value rule are during up to 14 lecture experiments, each lecture experiment can both be quick, numeral, intuitively, accurately, the stable performance demonstration, success ratio all is 100%, this experiment is novel, design, the structure and the experiment equipment of 14 lecture experiments of design, interconnect, the layout novelty, science, experiment equipment can not be scattered, teacher and non-instructional personnel, need to prepare the time of lecture experiment hardly, the structure letter is beautiful, lecture experiment is quick, convenient, in light weight, portablely carry lightly, manufacturing materials is easy to get, but the processing and manufacturing of general factory, cost is lower, domestic and international junior middle school of range of application, senior middle school, special secondary school, junior college, university, " physics ", " chemistry ", " labor skill ", " science popularization lecture ".Be in great demand, economic benefit is very high.

The purpose of this utility model is achieved in that by the charactron gauge outfit probe, electric field piece, power supply, portable casing are formed.

Described charactron gauge outfit 1 figure, it has four 0.8 inch charactron, the charactron gauge outfit that is assembled I, it has the voltmeter head function, and internal resistance is very high, and stable performance is highly sensitive, and power consumption is few, has specification product to buy on the market.Described probe: draw two probes from the charactron gauge outfit, black probe 3 is to decide zero potential point in electric field, red probe 4 is to measure the size of each point potential value and positive and negative value, test specification-1.5V～1.5V in electric field, before the test, when four charactrons all show " 0.0.0 ", test, suppose that certain some potential value is 1.2V in the electric field, then charactron shows 1.2V, if another potential value is-0.8V that then charactron shows " 0.8V ".

Described electric board: it is made up of the conductor electric board Fig. 6 in point charge electric board Fig. 2, electric dipole electric board Fig. 4, even electricity field field plate Fig. 5, the electric field; Described have a stream power supply; For in light weight, structure letter is beautiful, satisfies the lecture experiment effect, selects for use, power supply is 4.5 volts charactron gauge outfit, and by No. 1 dry cell power supply of 3 joint 1.5V, service time is very long, and the power supply of each piece electric board is with 1.5V, and 1 saves No. 5 dry cells, and service time is long.

Described suitcase body profile specification 11 * 28 * 38cm ³, can be integrated in the structure of 14 experiments and experiment equipment height within the casing, the structure letter is beautiful, portable light, and the demonstration operation is extremely quick and convenient.

This device can reach development purpose of the present utility model.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a charactron test structure diagrammatic sketch

Fig. 2 is the structure and the ultimate principle figure of point charge electric board demonstration electrostatic field potential value and potential value rule.

Fig. 3 is the structure and the experiment equipment wiring layout of point charge electric board demonstration electric field potential value and potential value rule.

Fig. 4 is the figure of electric dipole electric board demonstration electrostatic field potential value and potential value rule.

Fig. 5 is the figure of even electricity field field plate demonstration electric field potential value and potential value rule.

Fig. 6 is the figure of the conductor electric board demonstration equipotentiality body in the electric field.

Fig. 7 is " pivoted " electric board connection layout.

Fig. 8 is electric field version " pivoted ", " drawer type " configuration diagram.

Fig. 9 is the power lead connection layout.

Figure 10 is the utility model structural entity sketch

Ultimate principle of the present utility model is: this theory conclusion is compiled at People's Education Publishing House's physical cell, people education publishing house, in April, 1996 Hubei the 5th printing, senior middle school's textbook, the 3rd of physics (education), in the 286th page, this ultimate principle is arranged: " equipotential line of directly describing in the electric field is quite difficult; because the rule that electrostatic field and steady current are followed is similar, be to intend mutually doing experiment with the current field analog electrostatic field that forms on the conductive paper according to the rule that electrostatic field and steady current are followed " here.Ultimate principle of the present utility model also is to demonstrate the potential value of electrostatic field and electromotive force rule with the steady current field stimulation electrostatic field that forms on the conductive paper.

The utility model is Fig. 2 with the wiring layout of simulation measurement point electric charge electrostatic field potential value and potential value rule, and insulating base 5 is thick 3mm, long 20cm, the insulcrete of wide 17cm.With tackifier such as white glue with vinyl is a radius that the circular conductive paper 6 of 7cm (or is risen seal paper or spray layer of even, the film of thin carbon dust) sticks on the face of insulating base 5, yet the radius metal ring T that is 6.5cm, be placed on conductive paper 6 above, metal ring T and insulating base 5 usefulness screws are fastening, and metal ring 7 contacts well with conductive paper 6.In the lower end of insulation edge base plate 5 battery case 8 of putting No. 5 batteries of 1 joint is installed,, is drawn a section lead and be connected with the binding post 9 of metal ring 7 circle centre positions from an end of battery case 8.Binding post 9 contacts with conductive paper 6 well, and the other end of battery case 8 is drawn a section lead and is connected with metal ring 7.

"+" utmost point of No. 5 batteries of 1 joint of a voltage 1.5V, simulation binding post 9 is with positive point charge, metal ring 7 be No. 5 be pond "-" utmost point, metal ring 7 is to simulate metal ring 7 apart from positive point charge 9 at infinity in this experimental provision, physics theory is: apart from the infinite electromotive force nearby of point charge is zero potential, so the electromotive force of metal ring 7 is zero potentials in this experimental provision.Conductive paper 6 its characteristics are: resistance is big, can conduct electricity.Electric current 9 radially flows to metal ring 7 from the center of circle steady.On conductive paper 6, there is a field intensity direction radially, the steady current field of shape such as radial circle, the model of this steady current field is intended fully mutually with the electrostatic field model of charge generation on schedule, the potential value of these two electric fields and the rule of potential value are also intended fully mutually, therefore, with instrument the rule of the potential value of steady current field and potential value has been measured, then the potential value of positive charge electrostatic field and potential value rule have also just been simulated, the utility model observes directly the size of potential value in order to make naked eyes, the structure of the structure of Fig. 1 and Fig. 2 is become the structure of Fig. 3 in conjunction with lifting device.Black probe 3 contacting metal annulus 7, analogue zero electromotive force are selected in the outer infinite distant place of electric field; Red probe 4 contacts with conductive paper A point, if charactron 1 demonstration+0.8V, then A potential value of ordering in this steady current field is exactly+0.8V, and is similar according to the rule that follow electrostatic field and steady current field, then+and 0.8V can be used as the analogue value of positive point charge electrostatic field A point electromotive force.

The utility model is Fig. 4 with simulation rule amount eelctric dipole in the wiring layout of electrostatic field potential value and potential value rule; Insulating base 9l, also be a thick 3mm, long 20cm, the insulcrete of wide 17cm, conductive paper 10 also is to stick on 10 of the insulating bases with white glue with vinyl, put the battery case 11 of No. 5 dry cells of 1 joint, also be mounted in the lower end of insulating base 91, two section leads that extract from battery case 11 two ends respectively with binding post 12,13 connect, two binding posts 12,13 contact all well with conductive paper, No. 5 dry cells of 1 joint 1.5V are contained in 11 li of battery cases, have an electric dipole steady current field on conductive paper, this steady current field model is just being followed, negative point charge static field simulation is similar fully, contacts with 0 in the perpendicular bisector of electric dipole line with black probe 3.This experiment zero potential point fix on 0 point (annotate: according to theory, the algebraic sum of 0 potential value $\mathrm{Uo}=K\frac{+Q}{V}+K\frac{-Q}{V}=0$ ) red probe 4 contact B points, if charactron I is demonstration+0.6V, then steady current field B point electromotive force is exactly+0.6V ,+0.6V can be used as the analogue value of electric dipole electrostatic field B point electromotive force.

The structural drawing that the utility model is measured uniform electric field potential value and potential value rule with simulation is Fig. 5.Insulating base 14 also is a thick 3mm, long 20cm, the insulcrete of wide 17cm, conductive paper 15 also is to stick on the face of insulating base 14 with white glue with vinyl etc., article 2, identical bonding jumper 16,17 be placed on conductive paper 15 above, consistency from top to bottom, be parallel to each other, spacing is moderate, all be fastened on the insulating base 14 with screw, 2 strip metal bars 16,17 all contact with conductive paper 15 well, the battery case 18 of adorning No. 5 dry cells of 1 joint 1.5V also is installed in the lower end of insulating base 14,2 leads that extract from the two ends of battery case 18 respectively with 2 strip metal bars 16,17 connect, when 1 economize on electricity pressure is put into battery case 18 for 1.5V5 number dry cell, electric current from bonding jumper 17 steadys flow to bonding jumper 16, on the conductive paper between bonding jumper 17 and the bonding jumper 16, there is an even strong steady current field, this steady current field model is similar fully with the even strong electrostatic field model between the charged parallel plates capacitor two-plate, red probe 4 contacts with the C point, if charactron demonstration+0.95V, then steady current field C point electromotive force is+0.95V that+0.95V can be used as the analogue value of uniform electric field equally.

The structural drawing that the utility model is measured " conductor in the electric field, when electrostatic equilibrium, conductor is an equipotentiality body " with simulation is Fig. 6, and insulating base 19 also is thick 3mm, long 20cm, the insulcrete of wide 17cm.Conductive paper 20 also is to stick on the plate face of insulating base 19 with sticking Ji such as white glue with vinyl, binding post 23,24 are fastened on the insulating base 19, contact with conductive paper 20 well respectively, have the circular loop conductor 21 at the end be placed on conductive paper 20 above, it and insulating base 19 usefulness screws are fastening, and conductor 21 contacts well with conductive paper 20.

Adorn No. 5 dry cell battery cases 22 of 1 joint, also be mounted in the lower end of insulating base 19, draw from battery case 22 two ends 2 leads respectively with binding post 23,24 connect, No. 5 dry cells of 1 joint 1.5V are contained in the battery case 22, steady current flows to negative pole from positive pole, a steady current field is arranged between binding post 23 and the binding post 24, conductor 21 is in this steady current field, the black meter pen probe 3 of deciding zero potential contacts with the D point, the each point potential value that the red probe 4 of measurement potential value is measured on the conductors 21, if charactron shows all+0.14V that then conductor is exactly an equipotentiality body, this experiment has been verified " conductor in the electric field; when electrostatic equilibrium, conductor are equipotentiality bodies " this rule with simulation.

Fig. 7 is the insulating base 91 in the insulating base in Fig. 2 structure 5 and Fig. 4 structure, with two structure diagrams that metal loose-leaf 25,26 couples together that window door usefulness is installed.Its effect is after all the lecture experiment demonstrations above Fig. 2 structure finish, an insulating base 5 it is twisted in Fig. 2 structure as " leaf through a book ", make the experimental provision of Fig. 4 structure show that the student at the moment, the teacher demonstrates to the student the experimental provision of Fig. 4 again, equally, insulating base 14 in Fig. 5 structure also is connected with loose-leaf with edge base plate 9l in Fig. 4 structure, after the whole demonstrations of all lecture experiments of the experimental provision in Fig. 4 structure finish, insulating base in Fig. 4 structure 91 is also twisted over as " leaf through a book ", make the experimental provision in Fig. 5 structure do lecture experiment.The rest may be inferred, and all lecture experiments of the experimental provision in last Fig. 6 structure all demonstration finish, during collection, 4 blocks of low plates are mated together as " closing page ", whole experiment equipment height are integrated in the case are installed in, volume is little, in light weight, it is extremely convenient to guide and support and operate.The utility model " pivoted " structural type structure that Here it is.

Fig. 8 is Fig. 2, Fig. 4, Fig. 5, insulating base 5 in the experimental provision in Fig. 6 structure, 91,14,19 " pivoted " structural type, on four insulating bases, following alignment, about the standard of aliging, the structure letter is beautiful, the sheet metal 27 that the thin intensity of last piece insulating base 19 and " " type is fit to tightens together, four insulating bases are in vertical plateau, and when doing lecture experiment, four base plates and " " type sheet metal 27 are together as drawing " drawer ", move the front at casing Qianmen to, make the experimental provision lecture experiment on each piece base plate make each experimental phenomena, student's naked eyes can both be observed clear, comprise the lecture experiment that the experimental provision on last piece insulating base 19 is done.

After experiment finished, four insulating bases mated as closing page, then four base plates and " " type sheet metal 27 as pushing away " drawer ", advance in the casing together, this is " drawer type " structural type, and last disconnecting power switch closes that upper chamber door is portable to be carried.

Fig. 9 is that the working power 2 of charactron gauge outfit is

3 joints, No. 1 battery series connection total voltage 4.5V of 1.5V and the power supply of four electric boards all are the circuit diagrams of No. 5 dry cells of 1 joint 1.5V, all power supplys all totally one double-pole throw miniature 28 switches, make each operation step all extremely convenient.

Figure 10 is that " pivoted " of the present utility model, " drawer type " structural type electrostatic field electromotive force are drilled the one-piece construction sketch.Charactron gauge outfit I, power supply 2, black probe 3, red probe 4, insulating base 5, conductive paper 66, metal garden ring 7, the insulating base 5,91,14,19 of the electric board that " pivoted " structural type is four has overlapped; " drawer type " structural type type belongs to plate 27 entirely, be fixed on electric board insulating base lower end adorn 1 the joint, No. 5 dry cell boxes 8 of 1.5V, dpdt double-pole double-throw (DPDT) micro power switch 28, portable casing 29.Effect:

The first, have novelty, to the applying date, still unexposed at home " pivoted " of using the type, " drawer type " structural type electrostatic field electromotive force demonstrator:

Second, creative, before the applying date, when lecturing the important thing amount of electromotive force, always from the theory to the theory, perhaps using teaches students to this method understands the notion of electromotive force, in describing electric field during equipotential line, rest on for a long time and use galvanometer, probe, conductive paper, equipment such as battery are described equipotential line in the steady current field with analogy method, this analog result substitutes the equipotential line in the static electric field, but effect directly perceived is relatively poor, and it is remarkable to operate, equipment is scattered, more can not be quick, numeral, intuitively, the accurately stable rule of demonstrating the positive negative value of size of potential value and intuitively drilling the DC potential value.

The utlity model has novelty, charactron can be fast, numeral, directly perceived, the accurate size of each point potential value in the stable demonstration electric field, and positive negative value makes abstract the plan with fixed attention non-existently be difficult to think deeply the visualize of elusive electromotive force notion, digitizing, specialize.Quick, directly perceived, accurate, stable rule and the equipotential line model of verifying potential value variation in (or describing) electric field of energy.

The utility model design is extremely ingenious, and structure is the science novelty extremely, up within 14 integrated portable case types of demonstrating experiment device height.Dividing apparatus for converting on four electric boards up to 14 demonstrating experiment devices, during demonstration, again as " leaf through a book ", after doing several lecture experiments that are over, turn over an electric board, when " drawer type " structure of the utility model design is demonstrated any experiment, can both come the Qianmen that this experimental provision is extracted into casing in front of the door, but can not drop out, guarantee that each student can both observe very clearly to any one experiment.After lecture experiment was finished, four electric boards mated as " closing page ", as drawer four electric boards are pushed in then, highly are integrated in 11 * a 28 * 38cm ³Suitcase in, all experiment equipments are not scattered, all by the control of dpdt double-pole double-throw (DPDT) microswitch, experimental implementation is extremely easy, opens chamber door for all power supplys, inside be cannot see one and is connected lead (all walking concealed wire).All very simple U.S. of demonstration face in casing appearance or the case can improve the effect of observation of students experimental demonstration phenomenon greatly, and overall weight is light, and is portable very convenient to carry, and teacher and non-instructional personnel need to prepare the time of lecture experiment hardly.

The 3rd, have practicality

1, utilize Fig. 3 structural experiment device, can be fast, numeral, ocular demonstration: " the each point electromotive force all has certain large and small, positive and negative in the positive charge electric field ".Abstract electromotive force digitizing, visualize, specific.

2, can be fast, this rule of numeral, directly perceived, stable, checking " in the positive charge electric field each point potential value all be on the occasion of ".

3, can quick, digital, directly perceived, stable, checking " size of certain some electromotive force is relative in the electric field, and zero potential is selected in different points, and this electromotive force varies in size " this rule.

4, No. 5 dry cells of 1 joint in the battery case 8 are changed a stature, reinstall in the battery case 8, can quick, digital, directly perceived checking " the each point potential value all is a negative value in the negative charge electric field " this rule.

5, fast digital, directly perceived checking,＜or describe " in the point charge electric field, the model of equipotential line (face) is to be the concentric garden of cluster (sphere) of the garden heart with the point charge " this rule.

6, utilize Fig. 4 structural experiment device, can be fast, numeral, checking stable, directly perceived＜or describe equipotentiality line model in the electric dipole electric field, similar fully with electric dipole equipotential line model in " physics " teaching material.

7, utilize Fig. 5 structural experiment device can be fast, numeral, checking stable, directly perceived＜or describe " in the uniform electric field, equipotential line (face) model is the straight line (face) that cluster is parallel to each other " this rule.

8, can also be fast, numeral, directly perceived, stable checking " is the fastest direction of drop of potential along the field intensity direction " this rule.

9, utilize Fig. 6 can be fast, numeral, checking stable, directly perceived: " conductor in the electric field, when electrostatic equilibrium, conductor is an equipotentiality body " this physics law.

10, the utility model, because the charactron internal resistance is very high, can quick, numeral energising electrolytic condenser two-plate electromotive force extent and charged " ten " " one " polarity measured directly perceived.

11, can be fast, numeral, directly perceived accurately the survey declare whether balance of direct current bridge.

12, in the experiment of demonstrating electromagnetic induction phenomenon, can be fast, numeral is directly perceived, measures the maximal value of induced electromotive force and the direction of induced electromotive force exactly.

13, can be fast, numeral, directly perceived, survey whether declare object be conductor or insulator,＜be applied to " physics labor skill ", " science popularization lecture "

14, can be fast, numeral, directly perceived, survey whether declare liquid be electrolyte solution＜chemical experiment

More than experiment teacher and non-instructional personnel needs the time of how many preparing experiments hardly, and each lecture experiment success ratio all is 100%, and experiment equipment is easily bought, easy to manufacture＜common car, bore mill, dash, sawing machine, carpenter, solder technology cost is lower.

The utility model, domestic first platform embryo model machine has been trial-produceed successfully recently, can realize all designing requirements of the present utility model fully.(embryo model machine end is open)

The utility model, domestic, outer junior middle school " physics ", " labor technology ", " chemistry " senior middle school, special secondary school " physics ", " chemistry " junior college, university's " general physics " laboratory quantity can't be added up, and demand can't be added up, and economic benefit can't be added up.

Claims (1)

1, a kind of " pivoted ", " drawer type " electrostatic field electromotive force demonstrator, by charactron gauge outfit, probe, electric board, direct supply, casing, sequentially by electricity, " pivoted ", " drawer type " structure connects, it is characterized in that: described charactron gauge outfit ⁽¹⁾By four 0.8 inch charactron, circuit structure has the function of voltmeter head, direct supply voltage ⁽²⁾4.5 volt, described probe is the charactron table ⁽¹⁾Head is drawn two probes ^{(3), (4)}, test electric potential difference scope-1.5V～1.5V, described electric board:

The structure of point charge electric board is an insulating base ⁽⁵⁾The long 20cm of thick 3mm, the insulcrete of wide 17cm, sticking with glue agent is a radius the circular conductive paper of 7cm ⁽⁶⁾(or rise seal paper, or spray layer of even, thin carbon dust film) sticks on insulating base ⁽⁵⁾The plate face on, the metal ring 7 a radius is 6.5cm is placed on conductive paper ⁽⁶⁾Top with screw fastening, metal ring 7 and insulating base ⁽⁵⁾Fastening with screw, metal ring 7 contacts with conductive paper 6 well, from battery case ⁽⁸⁾An interior end that contacts with battery "+" utmost point draws a section lead, with the binding post of metal ring 7 circle centre positions ⁽⁹⁾Be connected, binding post 9 contacts with conductive paper 6 well, battery case ⁽⁸⁾An interior end that contacts with battery " " utmost point draws a section lead and metal ring 7 in succession;

The structure of electric dipole electric board: insulating board ⁽⁹¹⁾Also be the insulcrete of the wide 17cm of the long 20cm of thick 3mm, stick with glue agent conductive paper ⁽¹⁰⁾Stick on insulating base ⁽⁹¹⁾Panel on, two binding posts at regular intervals are arranged ^{(12), (13)}Contact well with conductive paper, adorn the battery case of No. 5 dry cells of 1 joint 1.5V ⁽¹¹⁾Be installed in insulating base ⁽⁹¹⁾Lower end, battery case ⁽¹¹⁾Two section leads are drawn at the two ends that connect battery "+" utmost point and "-" utmost point respectively, respectively with two binding posts ^{(12), (13)}Connect;

The structure of even electricity field field plate: insulating base ⁽¹⁴⁾, thickness 3mm, long 20cm, the insulcrete of wide 17cm sticks with glue agent conductive paper ⁽¹⁵⁾Stick on insulating base ⁽¹⁴⁾The plate face on, on conductive paper, two bonding jumpers are installed ^{(16), (17)}, two bonding jumpers ^{(16), (17)}Consistency from top to bottom, be parallel to each other, spacing is moderate, two bonding jumpers ^{(16), (17)}All contact well, adorn the battery case of No. 5 dry cells of a joint 1.5V with conductive paper ⁽¹⁸⁾, be fixed on insulating base ⁽¹⁴⁾The lower end, battery case ⁽¹⁸⁾Connect the two ends of battery "+", "-" utmost point, draw two section leads respectively, respectively with two bonding jumpers ^{(16), (17)}Connect;

The structure of the conductor electric board in the electric field: insulating base ⁽¹⁹⁾Also be thick 3mm, long 20cm, the insulcrete of wide 17cm sticks with glue agent conductive paper ⁽²⁰⁾Stick on insulating base ⁽¹⁹⁾The plate face on, on conductive paper, fix two binding posts ^{(23), (24)}, on insulating base ⁽¹⁹⁾The plate face on two binding posts ^{(23), (24)}With lead paper ⁽²⁰⁾Contact is good, between two binding posts, places the circular loop conductor that the end is arranged ⁽²¹⁾, use the key screw circular loop conductor ⁽²¹⁾Be fastened on insulating base ⁽¹⁹⁾Plate above, circular loop conductor ⁽²¹⁾Contact well with conductive paper, adorn the battery case of No. 5 dry cells of a joint 1.5V ⁽²²⁾, also be installed in insulating base ⁽¹⁹⁾The lower end, battery case ⁽²²⁾Two section leads are drawn at the two ends of contact battery "+", "-" utmost point respectively, respectively with two binding posts ^{(23), (24)}Connect;

The insulating base of first point charge electric board ⁽⁵⁾Insulating base with second electric dipole electric board ⁽⁹¹⁾Consistency from top to bottom is with two loose-leaves that the window door is installed ^{(25), (26)}Bookbinding is linked up, and makes insulating base ⁽⁵⁾And insulating base ⁽⁹¹⁾, both can open as " leaf through a book ", also can close up as " closing page "; Second insulating base then ⁽⁹¹⁾With the 3rd insulating base ⁽¹⁴⁾Also consistency from top to bottom also links up with two loose-leaves; The 3rd insulating base ⁽¹⁴⁾With the 4th insulating base ⁽¹⁹⁾Also consistency from top to bottom.Also link up four insulating bases with two loose-leaves ^{(5), (91), (14), (19)}Constitute " pivoted " structural type, each piece electric board both can be opened as " leaf through a book ", also can close up four base plates of " pivoted " structural type ^{(5), (91), (14), (19)}In rearmost the 4th insulating base ⁽¹⁹⁾Sheet metal with the L type of its back ⁽²⁷⁾Be fixed together symmetrically up and down, constitute " drawer type " structural type, during the utility model demonstration, can be extracted into the cabinet door front to four electric boards together as taking out " drawer ", but not drop out, demonstration finishes, four electric boards are closed up, advance casing together as pushing away " drawer " ⁽²⁹⁾Interior collection;

Described direct supply, the charactron gauge outfit ⁽¹⁾With No. 1 dry cell power supply of 3 joints, four electric boards of 4.5V are all used No. 5 dry cell power supplies of 1 joint 1.5V respectively altogether, all shared dpdt double-pole double-throw (DPDT) microswitch control of all power supplys;

Described casing ⁽²⁹⁾Be the portable case type casing, physical dimension is 38cm * 28cm * 11cm, the charactron gauge outfit ⁽¹⁾, probe ^{(3), (4)}, four pieces " pivoted " electric boards ^{(5), (91), (14), (19)}, L type sheet metal ⁽²⁷⁾And form " drawer type " structural type, direct supply ^{(2), (8), (11), (16), (18), (22)}Device is at portable casing ⁽²⁹⁾In, all parts, experiment equipment, casing interconnect, and are regardless of and disperse, and it is light U.S. whole to constitute letter, opens chamber door, puts through the CB common battery power switch of a 4.5V and 1.5V ⁽²⁸⁾, in a few minutes, can be fast, "+" "-" numeral, directly perceived, accurately, 14 lecture experiments such as stable, the positive and negative sizes values of demonstration electrostatic field electromotive force easy and simple to handle and electromotive force rule.

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