CN207742832U - A kind of len's law demonstration experimental provision - Google Patents
A kind of len's law demonstration experimental provision Download PDFInfo
- Publication number
- CN207742832U CN207742832U CN201820095979.9U CN201820095979U CN207742832U CN 207742832 U CN207742832 U CN 207742832U CN 201820095979 U CN201820095979 U CN 201820095979U CN 207742832 U CN207742832 U CN 207742832U
- Authority
- CN
- China
- Prior art keywords
- circuit
- len
- experimental provision
- law
- wiring board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
In order to quickly and intuitively demonstrate Lenz's law experiment, the utility model provides a kind of len's law demonstration experimental provision, is related to a kind of physics teaching in secondary school and laboratory apparatus.The device mainly includes display board, coil, bar-shaped magnet, power supply and wiring boards etc..The installation cost is cheap, easy to carry, easy to operate, and demonstration Lenz's law is with obvious effects, is conducive to understanding of the student to the law.
Description
Technical field
The present invention relates to a kind of physics teaching in secondary school and laboratory apparatus.
Background technology
At this stage, len's law demonstration experimental provision used in physics teaching in secondary school is typically with a coil tandem one
Sensitive galvanometer, pulls and pushes bar-shaped magnet in coil, allows the deflection direction of observation of students galvanometer pointer, induction and conclusion bar shaped
The relationship of the direction of motion and galvanometer throw of pointer direction of magnet, to obtain experiment conclusion.This experiment is in design, original
It is all fine in terms of reason, method and the participatory of student, but there are several deficiencies in practical operation：1, in concrete operations
In since it is desired that carry several sampling instruments such as sensitive galvanometer, coil and bar-shaped magnet, many teachers do not want to take the trouble, burden, are teaching
It is done less during learning or even does not do this lecture experiment；2, in order to avoid traction connecting wire and galvanometer in operation, usually connect
It is longer to connect conducting wire, farther out, laboratory apparatus needs account for wider place for coil and galvanometer distance；Although 3, galvanometer in an experiment
Can show induced current, but lack interest, always have student have no time to attend to observe simultaneously magnet pull and push with galvanometric deflection,
Teacher needs to make more explanation in teaching process, and the intuitive degree of experiment is not high, and verification the verifying results are not achieved.
Invention content
In order to quickly and intuitively demonstrate Lenz's law experiment, overcomes the shortcomings of above, the intuitive of experiment is made enhance,
Invention provides a kind of len's law demonstration experimental provision, is related to a kind of physics teaching in secondary school and laboratory apparatus.The device mainly wraps
Include display board, coil, bar-shaped magnet, power supply and wiring board etc..The installation cost is cheap, easy to carry, easy to operate, and demonstration is stupefied
Secondary law is with obvious effects, is conducive to understanding of the student to the law.It is more advantageous to the development of experiment and teaching.The present invention solves it
Scheme used by technical problem mainly has the following.
1. entire experimental provision is mainly made of display board, coil, bar-shaped magnet, switch, power supply, pedestal and wiring board,
In addition to bar-shaped magnet and power supply can be moved or be replaced, other parts are all connected to one.
2. wiring board circuit includes signal input circuit, negative feedback amplifier circuit, compares output circuit and driving display electricity
Four part of road, wherein signal input circuit by one anti-interference resistance of coil tandem, then with four substitutional resistances and a filtered electrical
Appearance composes in parallel.
3. the negative feedback amplifier circuit of wiring board circuit connects the output end of comparison amplifier and reversed defeated by a big resistance
Enter end composition.
4. the comparison output circuit of wiring board circuit is 2 by three ratios:1:2 resistance and two comparator compositions.
5. the driving display circuit of wiring board circuit is connected by four current-limiting resistances, two 9013 triodes with display board
Composition.
6. the circuit of display board is made of the LED light of two groups of different colours, each group is made of two branches, each
Branch connects 5 homochromy LED light, and interval connects, and is arranged in two and is directed toward the arrow shaped that opposite, arrow cabrage is closed.
It is cheap, easy to carry, easy to operate that the beneficial effects of the invention are as follows the installation costs, and demonstration Lenz's law effect is bright
It is aobvious, be conducive to understanding of the student to the law.The principle and experimentation entirely tested are little with the experiment difference on teaching material, letter
Single easy to operate, student's property of participation is strong.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, wherein.
Fig. 1 is the structural schematic diagram of the present invention.
Fig. 2 is the circuit composition frame chart of the present invention.
Fig. 3 is the circuit diagram of the present invention.
Fig. 4 is the LED light distribution map of the present invention.
Specific embodiment
The present invention proposes a kind of len's law demonstration experimental provision, and it is real fast, intuitively to demonstrate Lenz's law
It tests, to obtain experimental result rapidly.
The present invention structural schematic diagram as shown in Figure 1, the device mainly by display board（1）, coil（2）, bar-shaped magnet
（3）, switch（4）, power supply（5）, pedestal（6）And wiring board（7）Composition.Wherein remove bar-shaped magnet（3）And power supply（5）It can move
Or outside replacing, other parts are all connected to one.In the present embodiment, the dry cell of 4 section 1.5V is directly used to supply
Electricity.
Wiring board circuit composition frame chart is as shown in Fig. 2, including signal input circuit, negative feedback amplifier circuit, compare output
Four part of circuit and driving display circuit.
Detailed circuit diagram as shown in figure 3, wherein signal input circuit by one anti-interference resistance of coil tandem, then with four etc.
Value resistance and a filter capacitor compose in parallel, i.e. fixed value resistance R1 and coil（2）Series connection, then simultaneously with a polarity free capacitor C
Connection, C are mainly played a filtering role, and play the role of anti-external interference together with R1, R2, R3, R4 and R5 are four substitutional resistances, R2
It connects with R3, R4 and R5 series connection, R4, R5 are directly connected in the power circuit of 6V, the concatenated midpoint R4, R5 and R2, R3 series connection
Midpoint be connected.
In the present embodiment the negative feedback amplifier circuit of wiring board circuit by a 20K big resistance R6 connection comparison amplifiers A1
Output end and reverse input end composition.
The comparison output circuit of wiring board circuit is 2 by three ratios:1:2 resistance R7, R8, R9 and two comparators
A2, A3 are formed, the reverse input end phase of the output end of comparison amplifier A1 and the positive input of comparator A2 and comparator A3
Even.
The driving display circuit of wiring board circuit is by four current-limiting resistance R10, R11, R12, R13, two 9013 triodes
T1, T2 connect composition with display board, and the output end of comparator A2 is connected with the base stage of triode T1 through current-limiting resistance R10, compares
The output end of device A3 is connected through current-limiting resistance R11 with the base stage of triode T2.
The LED light of display board is distributed as shown in figure 4, its circuit is made of LED light D1, D2 of two groups of different colours, often
One group is made of two branches, and each branch connects 5 LED light, and interval connects, and is arranged in two and is directed toward opposite, arrow tail
The arrow shaped of coincidence, for simulating magnetic induction line direction.
It is first turned on switch（4）, the LED light group on the moment display board of starting switch can flicker, indicate power supply
It connects.When no signal inputs, the output end voltage of comparison amplifier A1 is about 3V, the positive input voltage of comparator A2
About 3V, reverse input end voltage are about 3.6V, then the output end of A2 exports low level, and the LED light group D1 of display board does not work；Than
Positive input voltage compared with device A3 is about 2.4V, and reverse input end voltage is about 3V, then the output end of A3 also exports low level,
The LED light group D2 of display board does not work yet.
Work as bar-shaped magnet（3）When insertion, forward sense voltage is generated in coil, after big resistance R6 negative-feedbacks amplification, than
Output end voltage compared with amplifier A1 is about 6V, and the positive input voltage of comparator A2 is also about 6V, reverse input end voltage
About 3.6V, then the output end of A2 export high level, the LED light group D1 of display board lights, arrow direction and the bar shaped magnetic of display
The magnetic induction line direction of body is opposite；The positive input voltage of comparator A3 is about 2.4V, and reverse input end voltage is about 6V, then A3
Output end export low level, the LED light group D2 of display board do not work.
Work as bar-shaped magnet（3）When extraction, reverse induction voltage is generated in coil, after big resistance R6 negative-feedbacks amplification, than
Output end voltage compared with amplifier A1 is about 0V, and the positive input voltage of comparator A2 is also about 0V, reverse input end voltage
About 3.6V, then the output end output low level of A2, the LED light group D1 of display board do not work；The positive input electricity of comparator A3
Pressure is about 2.4V, and reverse input end voltage is about 0V, then the output end of A3 exports high level, and the LED light group D2 of display board is lighted,
The arrow direction of display is identical as the magnetic induction line direction of bar-shaped magnet.
The purpose of the present invention is to provide a kind of experimental provision that can visually demonstrate Lenz's law, whole device structure letters
It is single, it is directed toward using the variations in light and arrow of LED light group, ocular demonstration Lenz's law is with obvious effects, and it is fixed to this to be conducive to student
The understanding of rule.
Claims (6)
1. a kind of len's law demonstration experimental provision, the device is mainly by display board, coil, bar-shaped magnet, switch, power supply, bottom
Seat and wiring board composition, it is characterised in that in addition to bar-shaped magnet and power supply can be moved or be replaced, other parts are all fixed companies
It is connected in integrated.
2. a kind of len's law demonstration experimental provision according to claim 1, it is characterised in that wiring board circuit includes letter
Number input circuit, negative feedback amplifier circuit compare four part of output circuit and driving display circuit, wherein signal input circuit by
One anti-interference resistance of coil tandem, then composed in parallel with four substitutional resistances and a filter capacitor.
3. a kind of len's law demonstration experimental provision according to claim 1, it is characterised in that wiring board circuit it is negative anti-
Feedback amplifying circuit connects the output end of comparison amplifier by a big resistance and reverse input end forms.
4. a kind of len's law demonstration experimental provision according to claim 1, it is characterised in that the comparison of wiring board circuit
Output circuit is 2 by three ratios:1:2 resistance and two comparator compositions.
5. a kind of len's law demonstration experimental provision according to claim 1, it is characterised in that the driving of wiring board circuit
Display circuit is connected with display board and is formed by four current-limiting resistances, two 9013 triodes.
6. a kind of len's law demonstration experimental provision according to claim 1, it is characterised in that the circuit of display board is by two
The LED light composition of group different colours, each group is made of two branches, each branch 5 homochromy LED light of connection, and
Every connecting, it is arranged in two and is directed toward the arrow shaped that opposite, arrow cabrage is closed, for simulating magnetic induction line direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820095979.9U CN207742832U (en) | 2018-01-21 | 2018-01-21 | A kind of len's law demonstration experimental provision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820095979.9U CN207742832U (en) | 2018-01-21 | 2018-01-21 | A kind of len's law demonstration experimental provision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207742832U true CN207742832U (en) | 2018-08-17 |
Family
ID=63122098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820095979.9U Active CN207742832U (en) | 2018-01-21 | 2018-01-21 | A kind of len's law demonstration experimental provision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207742832U (en) |
-
2018
- 2018-01-21 CN CN201820095979.9U patent/CN207742832U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201788611U (en) | Comprehensive electrical LED demonstrator | |
| CN207742832U (en) | A kind of len's law demonstration experimental provision | |
| CN204495942U (en) | electronic chip pin tester | |
| CN110070786A (en) | A kind of len's law demonstration experimental provision | |
| CN202487046U (en) | Ampere force teaching experimental device | |
| CN201527733U (en) | Teaching template for middle school circuit experiment | |
| CN203465879U (en) | Demonstration teaching aid for electromagnetic induction experiment | |
| CN201859586U (en) | Inductance characteristic experiment device used in virtual experimental teaching of circuit | |
| CN210804924U (en) | Teaching aid assembly for teaching of direct current principle | |
| CN203217846U (en) | Universal experimental equipment for circuit assembly | |
| CN200990161Y (en) | Multiple-aspect self-induction phenomenon demonstration instrument | |
| CN208477801U (en) | A kind of self-induction phenomenon demonstrator | |
| CN204758700U (en) | Adopt resistance to select separately teaching aid of measuring circuit | |
| CN202816234U (en) | Transformer working principle demonstration device | |
| CN2304962Y (en) | Demonstrator for magnet field intensity in electric solenoid | |
| CN201829102U (en) | Teaching demonstrator for displaying charging and discharging patterns of capacitor | |
| CN209543700U (en) | Series regulator fault analysis instrument | |
| CN109961679A (en) | Teaching electronic circuit experiment box | |
| CN212112933U (en) | Triode amplifying switch working performance demonstrator | |
| CN202838766U (en) | Fluorescent lamp test demonstration device | |
| CN205122052U (en) | Teaching that constitution was put to integrated fortune is with breathing lamp circuit | |
| CN206411976U (en) | A kind of universal electrotechnical, electronic actual training device | |
| CN206097647U (en) | Physics electricity experiment device | |
| CN113035032B (en) | Serial half-wave rectification type electricity stealing simulation device and simulation method | |
| CN211699417U (en) | A auxiliary device for circuit teaching |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |