CN214098869U - Physical experiment electricity voltmeter - Google Patents

Abstract

The utility model discloses a physics experiment electricity voltmeter, it relates to physics experiment field, the boss is equipped with threely, front end at the base through the elasticity buckle lock, the inside of boss is located to the conductive sleeve cover, together through the bolt fastening with the circuit board, the sleeve cover is established in the middle part recess of base, the gauge outfit embedding is assembled in the sleeve, the gauge needle is in the same place with the gauge outfit assembly, there is a series of scales on the dial plate, the bottom plate passes through the bottom of bolt fastening at the base, the circuit board passes through the lower extreme of bolt fastening at the base, conductive magnet passes through the mode embedding of interference assembly and installs in the bottom plate, the lower extreme of circuit board is located to the battery, wireless charging module locates the bottom plate top. The appearance and the structure of this voltmeter in the existing traditional physics experiment voltmeter of not changing have carried out intelligent upgrading to the voltmeter, reach intelligent monitoring's purpose, do not influence the step and the custom of student's operation components and parts after the optimization.

Description

Physical experiment electricity voltmeter

The technical field is as follows:

the utility model relates to a physics experiment electricity voltmeter belongs to physics experiment technical field.

Background art:

the physical experiment is an important basis of physical teaching and is used for verifying the theorem law of the physical discipline. On one hand, problems can be derived through physical experiments, and on the other hand, students can master basic knowledge and basic methods of the experiments through the physical experiments, and experiment skills and abilities are cultured, so that an ideal course culture target of physical courses is finally achieved.

In the circuit experiment in the physical experiment, a circuit is formed by connecting other electronic components such as a power supply, a switch, a bulb, a slide rheostat, an ammeter, a voltmeter and the like in series or in parallel in a certain relationship to form a circuit. In the physical experiment examination, the teacher observes the operation of the student to evaluate the physical experiment score.

At present, most of circuit experiment voltmeters have the following problems: 1. in the physical experiment examination, a teacher needs to observe the operation of students to give experiment scores, the scoring efficiency is low, and the possibility of misjudgment exists; 2. in the physical experiment examination process, whether the reading of the voltmeter read by a student is consistent with the actual reading can be judged only by human eyes, a teacher is required to perform accounting, and the voltage value of the voltmeter cannot be acquired from a background through an intelligent method; 3. the traditional cable wiring needs to unscrew a wiring screw head on the voltmeter, puts in a cable terminal and screws the wiring screw head, and is complex to operate.

The utility model has the following contents:

to the above problem, the to-be-solved technical problem of the utility model is to provide an intelligent degree is high, the simple operation, and data can monitor, can judge the physics experiment voltmeter of the wiring condition of voltmeter and the magnitude of voltage of current voltmeter.

The utility model relates to a physical experiment electricity voltmeter, which comprises a base, an upper cover, an adjusting knob, a boss, a conductive sleeve, a meter head, a meter needle, a dial plate, a bottom plate, a circuit board, a conductive magnet, a battery and a wireless charging module, wherein the base is a base body of the whole electricity voltmeter and is used for assembling other parts, the upper cover is transparent, the cover is arranged at the upper part of the base, the adjusting knob is arranged at the lower part of the upper cover and is used for zero adjustment of the meter head, the three bosses are buckled at the front end of the base through elastic buckles, the conductive sleeve is arranged inside the boss and is fixed with the circuit board through bolts, the sleeve is sleeved in a middle groove of the base, the meter head is embedded and assembled in the sleeve, the meter needle is assembled with the meter head and is used for indicating the current voltage value, the dial plate is provided with a series of scales corresponding to the actual voltage value of the meter needle, the bottom plate is fixed at the bottom of the base through bolts, the circuit board passes through the bolt fastening at the lower extreme of base, plays the effect of control to whole electricity voltmeter, and conductive magnet installs in the bottom plate through interference fit's mode embedding, and the lower extreme of circuit board is located to the battery, gives whole electricity voltmeter power supply, and wireless charging module locates the bottom plate top, can charge the operation to the battery after being close to with outside charging module, and it is mutual through specific assembly relation, constitutes the whole of a physics experiment electricity voltmeter.

Preferably, the base is a center of the whole voltmeter, the upper part of the base is inclined by an inclined plane and has a certain thickness, the base plays a role in beautifying and supporting and connecting other parts, the base comprises a sleeve mounting position, a gauge head mounting position, a dial plate mounting position, an upper cover mounting position, a boss mounting position, a conductive sleeve mounting position and a light hole, the sleeve mounting position is arranged in the middle of the base and is a cylindrical groove for clamping the sleeve, the gauge head mounting position is arranged in the middle of the base and is used for fixing a gauge head through a bolt, the dial plate mounting position is used for mounting the dial plate, the upper cover mounting position is used for mounting the upper cover, the three boss mounting positions are arranged at the front end of the base and are all raised all around and are used for mounting the boss, the conductive sleeve mounting position is also arranged at the front end of the base 1 and is a through hole inside the boss mounting position, the light-transmitting hole is a through hole and is arranged at the front end of the base, and an indicator light on the circuit board transmits light.

Preferably, the upper cover be the cuboid, the material is transparent material, installs on upper cover installation position through the bolt, can observe the reading of the table needle behind the upper cover on the dial plate.

Preferably, the lower part of the adjusting knob extends into the meter head, and the position of a pointer on the meter head can be adjusted by adjusting the rotating direction of the adjusting knob 3 externally, so that the voltmeter can be subjected to zero setting before the voltmeter is not used.

Preferably, the bosses are three and are annular and arranged at the front end of the base, a circular notch is formed in the middle of the bosses and used for the conductive sleeve to pass through, elastic buckling positions are arranged on two sides of the lower portion of the bosses and can be buckled and assembled with the base through the buckling positions, and the three bosses can be consistent in color or inconsistent in color and can be allocated according to the actual color.

Preferably, the conductive sleeve is annular, is made of conductive material, and is provided with a small hole at the bottom.

Preferably, the sleeve is annular and made of metal, and is sleeved in the sleeve mounting position of the base.

Preferably, the meter head is fixed on the meter head mounting position through bolts, is one of core components of the whole electric voltmeter, is internally provided with a coil, is concentric with the sleeve after being mounted, is suspended in the sleeve and is not in contact with the sleeve.

Preferably, the gauge needle is arranged on the gauge head, and the gauge head drives the gauge needle to rotate under the action of the magnetic field after being electrified so as to point to an accurate voltage value.

Preferably, the dial plate is arranged on the dial plate mounting position through a bolt, different scales are arranged on the dial plate, and the pointer points to the different scales when swinging, namely the current voltage value of the voltmeter.

Preferably, the bottom plate is rectangular and is arranged at the lower part of the base 1, and a rectangular notch is arranged in the middle of the bottom plate and is fixedly assembled with the base through a bolt.

Preferably, the circuit board is rectangular, the circuit board comprises a base plate, an indicator light, a resistor, a conductive sleeve screw hole and a circuit board screw hole, the base plate is a substrate of the circuit board, other electronic components are welded on the base plate, the indicator light, the resistor, the conductive sleeve screw hole and the circuit board screw hole are arranged on the base plate, the indicator light can emit light in a specific state through program setting, the working state indication or alarm prompt can be carried out on the electric battery box, the resistor is a resistor with a large resistance value and is connected with the meter head in series to form the function of the voltmeter, the conductive sleeve screw hole is used for assembling the bolt and the conductive sleeve, so that the conductive sleeve and the circuit board form a conductive relation, the conductive sleeve on the circuit board respectively represents different measuring ranges, for example, the measuring range of the voltmeter has '3V' and '15V' for selection, the conducting sleeve can represent a negative pole, a 3V range and a 15V range respectively, when the cable is connected with the negative pole and the 3V on the conducting sleeve, the range of the 3V range is selected by representing the range, so that a proper range is selected to connect two cables during actual wiring, the circuit board screw hole is used for fixedly assembling the bolt and the base, and an electric signal acquired by the circuit board can be transmitted to external equipment through Bluetooth or wifi.

Preferably, the conductive magnets are cylindrical and are embedded into the annular gap of the bottom plate in an interference fit mode, the number of the conductive magnets is not limited, and the conductive magnets are within the protection range of the patent.

Preferably, the battery is arranged at the lower part of the circuit board, is electrically connected with the circuit board, has certain electric quantity, and can supply power to other components through the circuit board.

Preferably, the wireless charging module is arranged above the bottom plate and can charge the battery after being close to the external charging module.

The utility model has the advantages that:

1. the voltmeter is intelligently upgraded without changing the appearance and the structure of the traditional physical experiment voltmeter, so that the purpose of intelligent monitoring is achieved, and the steps and habits of operating components and parts by students are not influenced after optimization;

2. in the physical experiment examination, the working state of the voltmeter is detected through the intelligent detection function of the circuit board, so that whether the operation of a student meets the requirement or not can be judged, and therefore the score of the physical experiment is given through a background program, and the traditional method that the score is given by human eyes is replaced;

3. through the processing of the signal of the circuit board, whether the voltmeter works currently or not, the operation information of operators such as a cable interface connected currently, the number of times of wiring, the time length and the like can be judged, the voltage information on the voltmeter can be monitored in real time, and the real-time monitoring and intelligent operation of the voltmeter can be realized;

4. the battery is arranged on the physical experiment voltmeter, so that the circuit board can be powered, and the way that an external cable is needed to power the circuit board is eliminated;

5. the physical experiment voltmeter is provided with a wireless charging module, and the wireless charging module can charge the battery after being close to an external charging module;

6. the cable interface adopts a direct-insertion connection mode of the conductive sleeve to replace the original connection mode of screwing the cable by a screwing head, and the connection mode is simple and reliable;

7. the indicator light on the circuit board can indicate the working state of the electric voltmeter or give an alarm.

Description of the drawings:

for ease of illustration, the invention is described in detail by the following detailed description and accompanying drawings.

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

fig. 2 is a bottom view of the present invention;

FIG. 3 is a schematic view of the internal structure of the present invention;

FIG. 4 is a schematic exploded view of the present invention;

FIG. 5 is a schematic structural view of the base of the present invention;

fig. 6 is a schematic structural diagram of the circuit board of the present invention;

fig. 7 is a schematic view of the usage state of the present invention.

1-a base; 1-1-a sleeve mounting position; 1-2-gauge head installation position; 1-3-dial installation position; 1-4-an upper cover mounting position; 1-mounting position of boss 4; 1-6-conductive sleeve mounting position; 1-7-light hole; 2-covering the upper cover; 3-adjusting knob; 4-boss; 5-a conductive sleeve; 6-a sleeve; 7-header; 8-a watch hand; 9-dial plate; 10-a base plate; 11-a circuit board; 11-1-a substrate; 11-2-indicator light; 11-3-resistance; 11-4-conductive sleeve screw holes; 11-5-circuit board screw holes; 12-a conductive magnet; 13-a battery; 14-wireless charging module.

The specific implementation mode is as follows:

as shown in fig. 1 to 7, the following technical solutions are adopted in the present embodiment: the electric voltmeter comprises a base 1, an upper cover 2, an adjusting knob 3, a boss 4, a conductive sleeve 5, a sleeve 6, a meter head 7, a meter pointer 8, a dial 9, a bottom plate 10, a circuit board 11, a conductive magnet 12, a battery 13 and a wireless charging module 14, wherein the base 1 is a base body of the whole electric voltmeter and is used for assembling other parts, the upper cover 2 is transparent and covers the upper part of the base 1, the adjusting knob 3 is arranged at the lower part of the upper cover 2 and is used for zero adjustment of the meter head 7, the three boss 4 are buckled at the front end of the base 1 through elastic buckles, the conductive sleeve 5 is sleeved inside the boss 4 and is fixed with the circuit board 11 through bolts, the sleeve 6 is sleeved in a groove in the middle part of the base 1, the meter head 7 is embedded and assembled in the sleeve 6, the meter pointer 8 is assembled with the meter head 7 and is used for indicating the current voltage value, the dial 9 is provided with a series of scales corresponding to the actual voltage value of the meter pointer 8, bottom plate 10 passes through the bolt fastening in the bottom of base 1, circuit board 11 passes through the bolt fastening at the lower extreme of base 1, play the effect of control to whole electricity voltmeter, conductive magnet 12 installs in bottom plate 10 through interference fit's mode embedding, the lower extreme of circuit board 11 is located to battery 13, supply power for whole electricity voltmeter, wireless charging module 14 is located bottom plate 10 top, can charge operation to battery 13 after being close to with the outside module of charging, it is mutual through specific assembly relation, constitute the whole of a physics experiment electricity voltmeter.

Wherein, the base 1 is the center of the whole voltmeter, the upper part of the base is provided with an inclined plane which is inclined and has a certain thickness and plays the roles of beautifying and supporting and connecting other parts, the base 1 comprises a sleeve mounting position 1-1, a gauge head mounting position 1-2, a dial plate mounting position 1-3, an upper cover mounting position 1-4, a boss mounting position 1-5, a conductive sleeve mounting position 1-6 and a light transmission hole 1-7, the sleeve mounting position 1-1 is arranged in the middle of the base 1 and is a cylindrical groove for clamping the sleeve 6, the gauge head mounting position 1-2 is arranged in the middle of the base 1 and is used for fixing the gauge head 7 through bolts, the dial plate mounting position 1-3 is used for mounting the dial plate 9, the upper cover mounting position 1-4 is used for mounting the upper cover 2, and the boss mounting positions 1-5 are three in total, the conductive sleeve mounting positions 1-6 are also arranged at the front end of the base 1, a through hole is formed inside the boss mounting positions 1-5 and used for embedding and mounting the conductive sleeve 5, and the light-transmitting hole 1-7 is a through hole and is arranged at the front end of the base 1 and used for transmitting light of an indicator lamp 11-2 on a circuit board; the upper cover 2 is cuboid and made of transparent materials, and is arranged on the upper cover mounting positions 1-4 through bolts, so that the reading of the pointer 8 behind the upper cover 2 on the dial plate 9 can be observed; the lower part of the adjusting knob 3 extends into the meter head 7, and the position of a meter pointer 8 on the meter head 7 can be adjusted by adjusting the rotating direction of the adjusting knob 3 externally, so that the voltmeter can be subjected to zero adjustment before the voltmeter is not used; the three bosses 4 are annular and arranged at the front end of the base 1, a circular notch is formed in the middle for the conductive sleeve 5 to pass through, elastic buckling positions are arranged on two sides of the lower part and can be buckled and assembled with the base 1 through the buckling positions, and the three bosses 4 can be consistent in color or inconsistent and can be allocated according to the actual color; the conductive sleeve 5 is annular, is made of conductive material, and is provided with a small hole at the bottom; the sleeve 6 is annular and made of metal and is sleeved in the sleeve mounting position 1-1 of the base 1; the meter head 7 is fixed on the meter head mounting position 1-2 through a bolt and is one of core components of the whole electric voltmeter, a coil is arranged in the meter head 7, and the meter head is concentric with the sleeve 6 after being mounted, is suspended in the sleeve 6 and is not in contact with the sleeve 6; the gauge needle 8 is arranged on the gauge head 7, and the gauge head 7 drives the gauge needle 8 to rotate under the action of a magnetic field after being electrified so as to point to an accurate voltage value; the dial plate 9 is arranged on the dial plate mounting positions 1-3 through bolts, different scales are arranged on the dial plate 9, and the pointer 8 points to the different scales when swinging, namely the current voltage value of the voltmeter; the bottom plate 10 is rectangular and is arranged at the lower part of the base 1, a rectangular notch is arranged at the middle part of the bottom plate, and the bottom plate and the base 1 are fixedly assembled together through bolts; the circuit board 11 is rectangular, the circuit board 11 comprises a base plate 11-1, an indicator light 11-2, a resistor 11-3, a conductive sleeve screw hole 11-4 and a circuit board screw hole 11-5, the base plate 11-1 is a base body of the circuit board 11, other electronic components are welded on the base plate 11-1, the indicator light 11-2, the resistor 11-3, the conductive sleeve screw hole 11-4 and the circuit board screw hole 11-5 are arranged on the base plate 11-1, the indicator light 11-2 can emit light in a specific state through program setting, can indicate the working state of an electric battery box or prompt an alarm, the resistor 11-3 is a resistor with a large resistance value and is connected with a meter head 7 in series to form the function of a voltmeter, the conductive sleeve screw hole 11-4 is used for assembling a bolt and the conductive sleeve 5, the conductive sleeve 5 and the circuit board 11 form a conductive relation, the conductive sleeve 5 on the circuit board 11 respectively represents different ranges, for example, the range of the voltmeter has '3V' and '15V' for selection, the conductive sleeve 5 can respectively represent 'negative pole', '3V' range and '15V' range, when the cable wiring is connected with the 'negative pole' and the '3V' on the conductive sleeve 5, the range of '3V' is selected for representing the range, so that a proper measuring range is selected for connecting two cables during actual wiring, the circuit board screw hole 11-5 is used for fixing and assembling a bolt and the base 1, and an electric signal acquired by the circuit board 11 can be transmitted to external equipment through Bluetooth or wifi; the conductive magnets 12 are cylindrical and are embedded into the annular gap of the bottom plate 10 in an interference fit manner, the number of the conductive magnets 12 is not limited and is within the protection range of the patent, preferably two conductive magnets are selected in the patent and are electrically connected with the circuit board 11 to form a parallel connection relationship, so that the conductive magnets can form a conductive effect with the circuit board 11 on one hand and can form a magnetic adsorption relationship with the metal surface of an external device on the other hand; the battery 13 is arranged at the lower part of the circuit board 11, is electrically connected with the circuit board 11, has certain electric quantity, and can supply power to other components through the circuit board 11; the wireless charging module 14 is disposed above the bottom plate 10, and can charge the battery 13 after being close to an external charging module.

When the specific embodiment works, the physical experiment electric voltmeter is placed on the working platform of the external device, the working plane in contact with the physical experiment electric voltmeter is made of metal materials, so that the conductive magnet 12 is in contact with the metal working plane, on one hand, the conductive magnet 12 and the metal working plane form electric connection under the action of electric conduction, on the other hand, the conductive magnet 12 and the metal working plane form a magnetic adsorption relation with the metal surface, so that the physical experiment electric voltmeter can be adsorbed on a working platform of an external device, then confirming the voltage range of the electric appliance element required to be measured by the voltmeter, selecting a proper measuring range, inserting two external cables of the electric appliance element into the cable interface with the measuring range corresponding to the conductive sleeve 5, the device and the tested electric appliance element form a parallel connection relation, and different physical experiment combinations can be formed through different connection modes of the voltmeter.

In the specific embodiment, when an electrical component to be measured forms a path relationship, the voltmeter is connected in a wiring manner, namely, voltage and current are provided for the voltmeter, a certain magnetic field is generated by the meter head 7, and a certain magnetic field force is generated by the meter head 7 and the sleeve 6 due to the magnetic field, so that the meter head 7 is driven to rotate, the 9-pointer deflects to different degrees, the current voltage value is indicated by the dial 9, and when an external cable is not connected with the voltmeter to form the path relationship, the voltmeter does not work.

In this embodiment, by processing the signal of the circuit board 11, it can be determined whether the voltmeter works currently, the cable interface connected currently, the number of times of wiring, the time length and other operation information of the operator, and the voltage information on the voltmeter can be monitored in real time, so as to realize data monitoring and intelligent operation of the voltmeter.

It should be noted that, because the number of the conductive magnets 12 is not limited, if the metal working plane of the external device is not flat, but because the conductive magnets 12 are disposed around the bottom plate 10, it can be ensured that at least one conductive magnet 12 is in contact with the metal working plane, and the conductive magnet 12 is electrically connected to the circuit board 11, so that the circuit board 11 is electrically connected to the metal working plane of the external device, and no matter the physical experiment voltmeter is placed at any position of the metal working plane, the external device can detect the physical experiment voltmeter placed on the metal working plane, and if a plurality of physical experiment voltmeters are placed on the metal working plane, the physical experiment voltmeter can be identified.

It should be noted that, after the physical experiment voltmeter is placed at a specific position of the external device, the wireless charging module 14 and the external device charging module are close to each other, and then the battery 13 can be charged, and the battery 13 can supply power to other components through the circuit board 11.

What need to provide is, the student can supply power for the return circuit that the physics experiment combination is constituteed through the power that the battery case was established, battery 13 supplies power for circuit board 11, data that circuit board 11 received are preserved and the analysis signal transmission to external equipment through bluetooth or wifi, through the processing to the signal, can judge whether the voltmeter is work at present, the cable interface that connects at present, operator's such as the number of times of wiring and time length operation information, and can real time monitoring to the voltage information on the voltmeter, realize real time monitoring and intelligent operation to the voltmeter.

The voltmeter of the embodiment intelligently upgrades the existing traditional physical experiment voltmeter without changing the appearance and structure of the voltmeter, so that the purpose of intelligent monitoring is achieved, and the steps and habits of operating components and parts by students are not influenced after optimization; in the physical experiment examination, the working state of the voltmeter is detected through the intelligent detection function of the circuit board, so that whether the operation of a student meets the requirement or not can be judged, and therefore the score of the physical experiment is given through a background program, and the traditional method that the score is given by human eyes is replaced; through the processing of the signal of the circuit board, whether the voltmeter works currently or not, the operation information of operators such as a cable interface connected currently, the number of times of wiring, the time length and the like can be judged, the voltage information on the voltmeter can be monitored in real time, and the real-time monitoring and intelligent operation of the voltmeter can be realized; the battery is arranged on the physical experiment voltmeter, so that the circuit board can be powered, and the way that an external cable is needed to power the circuit board is eliminated; the physical experiment voltmeter is provided with a wireless charging module, and the wireless charging module can charge the battery after being close to an external charging module; the cable interface adopts a direct-insertion connection mode of the conductive sleeve to replace the original connection mode of screwing the cable by a screwing head, and the connection mode is simple and reliable; the indicator light on the circuit board can indicate the working state of the electric voltmeter or give an alarm.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. An electrical voltmeter for physical experiment, which is characterized in that: the multifunctional watch comprises a base (1), an upper cover (2), an adjusting knob (3), bosses (4), conductive sleeves (5), a sleeve (6), a watch head (7), a watch hand (8), a dial plate (9), a bottom plate (10), a circuit board (11), conductive magnets (12), a battery (13) and a wireless charging module (14), wherein the upper cover (2) is transparent and is arranged on the upper part of the base (1), the adjusting knob (3) is arranged on the lower part of the upper cover (2), the bosses (4) are three and are buckled at the front end of the base (1) through elastic buckles, the conductive sleeves (5) are sleeved inside the bosses (4) and are fixed with the circuit board (11) through bolts, the sleeve (6) is sleeved in a groove in the middle part of the base (1), the watch head (7) is embedded and assembled in the sleeve (6), the watch hand (8) and the watch head (7) are assembled together, a series of scales are arranged on the dial plate (9), bottom plate (10) pass through the bolt fastening in the bottom of base (1), and circuit board (11) pass through the bolt fastening at the lower extreme of base (1), and conductive magnet (12) are installed in bottom plate (10) through interference fit's mode embedding, and the lower extreme of circuit board (11) is located in battery (13), and bottom plate (10) top is located in wireless charging module (14).

2. A physical experiment electric voltmeter according to claim 1, wherein: the base (1) comprises a sleeve mounting position (1-1), a gauge head mounting position (1-2), a dial plate mounting position (1-3), an upper cover mounting position (1-4), a boss mounting position (1-5), three conductive sleeve mounting positions (1-6) and light holes (1-7), wherein the sleeve mounting positions (1-1) are arranged in the middle of the base (1) and are cylindrical grooves, the gauge head mounting position (1-2) is arranged in the middle of the base (1), the boss mounting positions (1-5) are three in number and are arranged at the front end and are protruded on the periphery of the base (1), the conductive sleeve mounting positions (1-6) are also arranged at the front end of the base (1), a through hole is formed inside the boss mounting positions (1-5), and the light holes (1-7) are through holes, is arranged at the front end of the base (1).

3. A physical experiment electric voltmeter according to claim 1, wherein: the upper cover (2) is cuboid and made of transparent material, and is arranged on the upper cover mounting positions (1-4) through bolts.

4. A physical experiment electric voltmeter according to claim 1, wherein: the three bosses (4) are annular and are arranged at the front end of the base (1), a circular notch is formed in the middle of each boss, and elastic buckling positions are arranged on two sides of the lower portion of each boss and are buckled with the base (1) through the buckling positions.

5. A physical experiment electric voltmeter according to claim 1, wherein: the conductive sleeve (5) is in a circular ring shape and made of a conductive material, and a small hole is formed in the bottom of the conductive sleeve.

6. A physical experiment electric voltmeter according to claim 1, wherein: the sleeve (6) is annular and made of metal and is sleeved in the sleeve mounting position (1-1) of the base (1).

7. A physical experiment electric voltmeter according to claim 1, wherein: the gauge head (7) is fixed on the gauge head mounting position (1-2) through a bolt, and a coil is arranged in the gauge head (7).

8. A physical experiment electric voltmeter according to claim 1, wherein: the dial plate (9) is arranged on the dial plate mounting positions (1-3) through bolts, and different scales are arranged on the dial plate (9).

9. A physical experiment electric voltmeter according to claim 1, wherein: the bottom plate (10) is rectangular and is arranged at the lower part of the base (1), and a rectangular notch is arranged at the middle part and is fixedly assembled with the base (1) through a bolt.

10. A physical experiment electric voltmeter according to claim 1, wherein: the circuit board (11) is rectangular, the circuit board (11) comprises a base plate (11-1), an indicator lamp (11-2), a resistor (11-3), a conductive sleeve screw hole (11-4) and a circuit board screw hole (11-5), the base plate (11-1) is a base body of the circuit board (11), other electronic components are welded on the base plate (11-1), the base plate (11-1) is provided with the indicator lamp (11-2), the resistor (11-3), the conductive sleeve screw hole (11-4) and the circuit board screw hole (11-5), the conductive magnet (12) is cylindrical and is embedded into an annular notch of the base plate (10) in an interference fit mode, and the battery (13) is arranged on the lower portion of the circuit board (11) and is electrically connected with the circuit board (11).

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