CN214475898U

CN214475898U - Current formation reason demonstration instrument

Info

Publication number: CN214475898U
Application number: CN202120701891.9U
Authority: CN
Inventors: 章乐
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2021-10-22
Anticipated expiration: 2031-04-07

Abstract

The utility model provides a current formation reason demonstration instrument, which is used for demonstrating the process of forming current by charge and free charge directional movement, and comprises a transparent box body and a transparent top plate detachably connected with the transparent box body, a closed space is formed between the transparent box body and the transparent top plate, a pointer type electrometer dial is fixed in the transparent box body, a plurality of scale marks are arranged on the pointer type electrometer dial, a first electrometer, a rotating handle and a second electrometer are sequentially fixed on the transparent top plate, a metal rod is fixed at the bottom of the rotating handle, the structure has the advantages that the air flow is stable in the process of demonstration experiments by putting the electrometers and the metal rod into the same transparent closed experiment box, the charge movement is not easily influenced by the environment, the success rate of teaching experiments can be improved, and the open angle of the pointer type metal foil of the electrometer can be clearly seen through the pointer type electrometer dial, the visualization degree is high.

Description

Current formation reason demonstration instrument

Technical Field

The utility model relates to a teaching instrument technical field specifically is an electric current forms reason demonstration appearance.

Background

The experiment of 'directional movement of charges in a conductor' is the content of the first section 'charges' of the ninth-year physical chapter fifteenth of the human education edition. This section is the first class of electricity for students in junior high school. In this class, students know that the directional movement of charges and free charges forms current. The current concept is the key point of the teaching and is also a difficult point, and the teaching content has the characteristics of abstraction, high teaching difficulty, less student life experience and high understanding difficulty. The operation steps of the experiment in the textbook are that two electroscopes are selected firstly, the glass rod is electrified by rubbing the glass rod through silk, and then the glass rod is contacted with the metal ball of the first electroscope, so that the first electroscope is electrified, and the second electroscope is uncharged. The second electroscope metal foil can be observed to be open and the second electroscope metal foil is not open. Then, the teacher puts the rubber rod and the metal rod between the metal balls of the two electroscopes in an orderly way, the student observes what the opening angle of the metal foil of the electroscopes in the two experiments changes, and the difference of the two experiments is analyzed to obtain a conclusion.

As can be seen from the above experiment, the experiment has the following disadvantages in practical operation: 1) the first electroscope has a limited charge. Since the charge is distributed over the two electroscopes and the metal rod during the connection process, the second electroscope can be charged less. 2) The metal rod is too long. Since the charge is distributed more on the outer surface of the conductor, especially at the tip of the conductor, less charge is moved to the metal foil. 3) The operation difficulty of the teacher erecting two electroscopes is high. The teacher has difficulty in simultaneously contacting the tip of the metal rod to the metal balls of the two electroscopes, and often the non-tip portion contacts the metal balls. 4) Although the metal foil of the electroscope has a relatively closed space and can retain charges for a period of time, the metal rod is exposed in a space where gas frequently flows for experiments, and a large amount of free charges are easily neutralized by the charges in the air in the process due to the influence of the ambient temperature and humidity. 5) After the second electroscope metal foil is opened, the opening angle of the first electroscope metal foil is not obviously changed, and the visualization degree is low. The teacher often needs to try many times in a classroom to generate an experimental phenomenon, the phenomenon is not obvious, and a current concept cannot be summarized smoothly, so that students are confused about the formation of current, and the class hour progress is greatly influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an experiment effect is stable, easy and simple to handle, the high electric current of visual degree forms reason demonstration appearance, has solved current demonstration teaching, and the metal pole is located open space, and the charge removes and easily receives the environmental impact to and the teacher opens the unobvious angle at demonstration in-process electrometer pointer, and visual degree is low, needs the problem of repeated experiment.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a current forms reason demonstration appearance for demonstrate the process that electric charge and free charge directional movement formed the electric current, include transparent box body and with the detachable transparent roof of being connected of transparent box body, and constitute the enclosure space between transparent box body and the transparent roof, be fixed with pointer type electrometer calibrated scale in the transparent box body, be equipped with a plurality of scale marks on the pointer type electrometer calibrated scale, be fixed with first electrometer, twist grip and second electrometer on the transparent roof in proper order, the twist grip bottom is fixed with the metal pole, the length of metal pole accords with the interval between first electrometer and the second electrometer.

Preferably, the first electrometer and the second electrometer are both connected with the transparent top plate through an electrometer fixing nut.

Preferably, an insulating pad is arranged on the static meter fixing nut.

Preferably, the first and second electrometers each include a metal ball, an electrometer metal connecting rod fixedly connected to the bottom of the metal ball, and a pointer-type metal foil mounted in the middle of the electrometer metal connecting rod.

Preferably, one side of the joint of the rotating handle and the transparent top plate is provided with a first fixing ring, the other side of the joint of the rotating handle and the transparent top plate is provided with a second fixing ring, and the first fixing ring and the second fixing ring are nested on the rotating handle.

Preferably, the metal rod is made of a copper wire.

Preferably, the thickness of the transparent box body and the transparent top plate ranges from 2mm to 5 mm.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses an in putting into same transparent closed experiment box with electrometer and metal pole, the air current is stable in the demonstration experimentation, and the charge removes and is difficult for receiving the environmental impact, can improve the success rate of teaching experiment.

2. The utility model discloses a manual rotation metal pole just can make the metal pole both ends contact the electrometer simultaneously, and easy operation simultaneously is according to correct experimental procedure operation, can be clear see the opening angle change of electrometer pointer-type metal forming through pointer-type electrometer calibrated scale, and visual degree is high, and experimental phenomenon is obvious, can draw forth the formation reason of electric current smoothly in the classroom, obtains the notion of electric current, and classroom is efficient.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is an enlarged view of a portion a in fig. 1 according to the present invention.

In the figure: 1. a first electrometer; 2. rotating the handle; 3. a second electrometer; 4. a metal rod; 5. an insulating pad; 6. an electrometer securing nut; 7. a metal ball; 8. a transparent top plate; 9. a transparent box body; 10. a dial of a pointer type electrometer; 11. an electrometer metal connecting rod; 12. pointer type metal foil; 13. a first retaining ring; 14. a second retaining ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in the attached drawing 1, the utility model provides an electric current forms reason demonstration appearance for the process of demonstration charge and the directional removal formation electric current of free charge, including transparent box body 9 and with the transparent roof 8 of the detachable connection of transparent box body 9, and constitute the enclosure space between transparent box body 9 and the transparent roof 8, put into same transparent closed experiment box body with the device of demonstration appearance, the air current is stable, and the charge removal is difficult for receiving the environmental impact.

The transparent box body 9 is internally fixed with a pointer type electrometer dial 10, the pointer type electrometer dial 10 is provided with a plurality of scale lines, the transparent top plate 8 is sequentially fixed with a first electrometer 1, a rotating handle 2 and a second electrometer 3, the bottom of the rotating handle 2 is fixed with a metal rod 4, the length of the metal rod 4 is consistent with the distance between the first electrometer 1 and the second electrometer 3, the first electrometer 1 and the second electrometer 3 both comprise a metal ball 7, an electrometer metal connecting rod 11 fixedly connected with the bottom of the metal ball 7 and a pointer type metal foil 12 are arranged between the metal connecting rod 11 and the electrometer metal foil, the pointer type metal foil 12 is corresponding to the vertical scale line position of the pointer type electrometer dial 10 when in the vertical position, and the pointer type metal foil 12 of the first electrometer 1 and the second electrometer 3 is influenced by the movement of charges in the teaching demonstration process, the pointer can be opened or the corresponding angle can be reduced, the angle change can be clearly seen through the dial 10 of the pointer type electrometer, and the visualization degree is high.

First electrometer 1, second electrometer 3 all are connected with transparent roof 8 through electrometer fixation nut 6, be equipped with insulating pad 5 on the electrometer fixation nut 6, the material of metal pole 4 is the copper wire, the thickness scope of transparent box body 9 and transparent roof 8 is 2mm-5 mm.

As shown in the attached drawing 2, one side of the joint of the rotating handle 2 and the transparent top plate 8 is provided with a first fixing ring 13, the other side of the joint is provided with a second fixing ring 14, the first fixing ring 13 and the second fixing ring 14 are embedded on the rotating handle 2, so that the rotating handle 2 is suspended and cannot move up and down, the two ends of the metal rod 4 can be simultaneously contacted with the electrometer metal connecting rod 11 of the first electrometer 1 and the second electrometer 3 by adjusting the rotating handle 2, the operation is simple, and the error rate is low.

When the utility model is used for demonstration teaching, the experimental device is firstly adjusted, the first electrometer 1, the rotating handle 2 and the second electrometer 3 are arranged in the sealed transparent box body 9 through the transparent top plate 8, before the experiment begins, the metal rod 4 can not contact with the electrometer, then, the glass rod is charged by rubbing silk or the rubber rod is charged by rubbing fur, the charged glass rod or rubber rod is contacted with the metal ball 7 of the first electrometer 1 to deflect the pointer type metal foil 12 of the first electrometer 1, then the metal rod 4 is contacted with the electrometer metal connecting rod 11 of the first electrometer 1 and the second electrometer 3 simultaneously in a rotating way through the rotating handle 2, the phenomenon that the deflection angle of the pointer type metal foil 12 of the second electrometer 3 is increased and the deflection angle of the pointer type metal foil 12 of the first electrometer 1 is decreased can be observed.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A kind of electric current forms the reason demonstration appearance, is used for demonstrating the course that electric charge and free charge directional movement formed the electric current, characterized by: including transparent box body (9) and with transparent roof (8) of transparent box body (9) detachable connection, and constitute the enclosure space between transparent box body (9) and transparent roof (8), transparent box body (9) internal fixation has pointer type electrometer calibrated scale (10), be equipped with a plurality of scale marks on pointer type electrometer calibrated scale (10), be fixed with first electrometer (1), twist grip (2) and second electrometer (3) on transparent roof (8) in proper order, twist grip (2) bottom is fixed with metal pole (4), the length of metal pole (4) accords with the interval between first electrometer (1) and second electrometer (3).

2. The apparatus for demonstrating the reason for current formation according to claim 1, wherein: the first electrometer (1) and the second electrometer (3) are connected with the transparent top plate (8) through electrometer fixing nuts (6).

3. The apparatus for demonstrating the reason for current formation according to claim 2, wherein: and an insulating pad (5) is arranged on the static meter fixing nut (6).

4. The apparatus for demonstrating the reason for current formation according to claim 3, wherein: the first electrometer (1) and the second electrometer (3) both comprise a metal ball (7), an electrometer metal connecting rod (11) fixedly connected with the bottom of the metal ball (7) and pointer type metal foils (12) arranged in the middle of the electrometer metal connecting rod (11).

5. The apparatus for demonstrating the reason for current formation according to claim 1, wherein: the handle is characterized in that a first fixing ring (13) is arranged on one side of the joint of the rotating handle (2) and the transparent top plate (8), a second fixing ring (14) is arranged on the other side of the joint, and the first fixing ring (13) and the second fixing ring (14) are nested on the rotating handle (2).

6. The apparatus for demonstrating the reason for current formation according to claim 1, wherein: the metal rod (4) is made of copper wires.

7. The apparatus for demonstrating the reason for current formation according to claim 1, wherein: the thickness range of the transparent box body (9) and the transparent top plate (8) is 2mm-5 mm.