CN108510856B - Drum-type potentiometer teaching aid for physical experiment and application method thereof - Google Patents
Drum-type potentiometer teaching aid for physical experiment and application method thereof Download PDFInfo
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- CN108510856B CN108510856B CN201810625212.7A CN201810625212A CN108510856B CN 108510856 B CN108510856 B CN 108510856B CN 201810625212 A CN201810625212 A CN 201810625212A CN 108510856 B CN108510856 B CN 108510856B
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- 238000002474 experimental method Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- 239000000523 sample Substances 0.000 claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 210000004899 c-terminal region Anatomy 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/187—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for measuring instruments
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Algebra (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Physics (AREA)
- Computational Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention provides a drum-type potentiometer teaching aid for physical experiments and a use method thereof, comprising a supporting device and a measuring device, wherein the measuring device comprises a drum and a shaft, a resistance wire is wound outside the drum, and a scale is arranged along the winding direction of the resistance wire; the two ends of the roller are provided with an A wiring terminal and a B wiring terminal, the shaft is provided with an A copper ring and a B copper ring, the A copper ring is connected with an A carbon brush, the B copper ring is connected with a B carbon brush, the A carbon brush is connected with the initial end of the resistance wire through an A wire, the B carbon brush is connected with the tail end of the resistance wire through a B wire, the A wiring terminal is connected with the A copper ring through a C wire, and the B wiring terminal is connected with the B copper ring through a D wire; the supporting device is provided with a probe assembly capable of sliding along the radial direction of the roller, the probe assembly and the resistance wire can be in electrical contact, and the probe assembly is connected with a C wiring terminal. The structure is simple, and the design is ingenious; small size, small occupied space, simple operation, more accurate measurement result and the like.
Description
Technical Field
The invention relates to the technical field of physical teaching aids, in particular to a roller type potentiometer teaching aid for physical experiments and a use method thereof.
Background
The DC potential difference meter is an accurate instrument for measuring the electromotive force of the power supply by using a compensation method and a comparison method. The device can be used for accurately measuring electromotive force, voltage, current, resistance and the like, can be used for calibrating a precise ammeter, and is widely applied to non-electric measuring instruments and automatic measuring and controlling systems.
The conventional 11-bit potentiometer for teaching has a plurality of defects in use, such as: the size is large, a large experimental platform is required to be occupied, the number of copper binding posts is up to 11, and a certain resistance exists in the binding posts, so that an error exists in a measurement result; the binding posts are more, the operation is troublesome, and a proper balance point can be found only by multiple attempts, so that the principle of an experiment is inconvenient to understand; the teaching aid is similar to an ancient musical instrument, students can stir frequently, and damage to instruments and reduction of measurement accuracy are easy to cause; the length of the wire which bypasses the binding post is not calculated in the total length, so that the measured length is low, and finally the measured electromotive force is inaccurate.
Therefore, how to provide a drum-type potentiometer teaching aid for physical experiments and a use method thereof is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a drum-type potentiometer teaching aid for physical experiments and a use method thereof, which solve the defects in the prior art, and the specific scheme is as follows:
the invention claims a drum-type potential difference meter teaching aid for physical experiments, which comprises a supporting device and a measuring device, wherein the measuring device comprises a drum 30 and a shaft 21, a resistance wire 31 is wound outside the drum 30, and a scale 32 is arranged along the winding direction of the resistance wire 31; the two ends of the roller 30 are provided with an A wiring terminal 50 and a B wiring terminal 51, the shaft 21 is provided with an A copper ring 211 and a B copper ring 212, the A copper ring 211 is connected with an A carbon brush 213, the B copper ring 212 is connected with a B carbon brush 214, the A carbon brush 213 is connected with a resistance wire starting end 310 through an A wire 60, the B carbon brush 214 is connected with a resistance wire tail end 311 through a B wire 61, the A wiring terminal 50 is connected with the A copper ring 211 through a C wire 62, and the B wiring terminal 51 is connected with the B copper ring 212 through a D wire 63; the supporting device is provided with a probe assembly capable of sliding along the radial direction of the roller 30, the probe assembly and the resistance wire can be in electrical contact, and the probe assembly is connected with a C wiring terminal 52.
Specifically, the roller 30 is made of transparent material, the shaft 21 is further provided with a light source 70, and the light source 70 is preferably an LED light source.
Specifically, the supporting device comprises a base 10 and side supporting plates 20 arranged at two ends of the base 10, the side supporting plates 20 are arranged at two ends of the shaft 21, and the probe assembly slides along the axial direction of the roller 30 through a sliding rail 11 arranged at one side of the base 10.
Specifically, the probe assembly includes a slider 40 disposed on the slide rail 11, and a support bar 41 and a metal contact piece 42 sequentially connected with the slider 40, where the metal contact piece is directly contacted with the resistance wire 31.
Specifically, the length of the scale 32 is 800mm to 1100mm, preferably 1100mm.
The invention also claims a circuit connection mode based on the device, specifically, the A wiring terminal 50 is connected with the positive electrode of the power supply E, and the B wiring terminal 51 is connected with the electric key K 1 Is connected with the key K 1 A rheostat R is arranged between the power supply E and the transformer 0 The A wiring terminal is also connected with a current detector G which is connected with a tested power supply E X Or standard battery E 0 The tested power supply E X Or standard battery E 0 Through electric key K 2 Is in communication with the C terminal 52.
The invention also claims a potential difference calculation method based on a drum-type potential difference meter teaching aid for physical experiments, which comprises the following steps:
s1: connecting a test circuit in the manner of claim 6;
s2: electric key K 2 And a measured power supply E X Connecting;
s3: switch-on key K 1 ；
S4: rotating the roller handwheel 33 to cause the metal contact 42 to continuously slide over the resistance wire 30;
s5: observing the deflection condition of the pointer of the galvanometer G until the pointer of the galvanometer G points to the scale mark of 0, and stopping rotating the roller hand wheel 33;
s6: recording the scale value L of the position of the scale 32 where the metal contact 42 is located x Then E x ＝I 0 r 0 L x ；
S7: key K 2 And standard battery E 0 Connecting, repeating the steps S4-S6, and recording the scale value L of the position of the scale 32 where the metal contact piece 42 is positioned 0 Then E 0 ＝I 0 r 0 L 0 Wherein r is 0 For the resistance per unit length of the resistance wire, I 0 An operating current flowing through the resistance wire;
s8: combining the two formulas E x ＝I 0 r 0 L x And E is 0 ＝I 0 r 0 L 0 After division, the power supply E to be measured can be obtained X Electromotive force:
the above shows that the electromotive force E of the power supply to be measured X Standard battery E 0 L measured in the state of compensation of the potentiometer x And L 0 The value is determined.
Preferably, the electromotive force of the standard battery E0 is 1.0186V.
Compared with the prior art, the invention has the advantages that: the resistance wire on the roller is connected with the binding post by a carbon brush, so that the structure is simple, and the design is ingenious; the size is small, the occupied space is small, and multiple groups of students can perform experiments simultaneously in a limited space; the number of the binding posts is only 3, so that the accuracy of the measurement result is higher; the operation is simple, the balance point can be found by only starting to rotate the roller from one end and one stroke, and meanwhile, the understanding is convenient; the teaching aid is protected, and the expense of teaching cost is saved; the measured value is the actual length value of the metal wire, so that the measured result is more accurate; the inside has increased illumination LED, makes the scale value more clear legible.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a schematic view of the internal structure of the present invention;
FIG. 4 is a schematic diagram of a circuit connection according to the present invention;
FIG. 5 is an expanded schematic view of the scale;
in the figure: 10. base 11, slide rail 12, stop device 20, side backup pad 21, axle 210, insulator 211, a copper ring 212, B copper ring 213, a carbon brush 214, B carbon brush 30, cylinder 31, resistance wire 310, resistance wire start 311, resistance wire end 32, scale 33, rotatory hand wheel 40, slider 41, bracing piece 42, metal contact 50, a binding post 51, B binding post 52, C binding post 60, a wire 61, B wire 62, C wire 63, D wire 70, light source.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic overall structure of the present invention, fig. 2 is a schematic side view of the present invention, fig. 3 is a schematic internal structure of the present invention, fig. 4 is a schematic circuit connection of the present invention, fig. 5 is a schematic scale development, and referring to fig. 1-5, the present invention claims a drum-type potentiometer teaching aid for physical experiment, which comprises a supporting device and a measuring device, wherein the measuring device comprises a drum 30 and a shaft 21, a resistance wire 31 is wound outside the drum 30, and a scale 32 is provided along a winding direction of the resistance wire 31; the two ends of the roller 30 are provided with an A wiring terminal 50 and a B wiring terminal 51, the shaft 21 is provided with an A copper ring 211 and a B copper ring 212, the A copper ring 211 is connected with an A carbon brush 213, the B copper ring 212 is connected with a B carbon brush 214, the A carbon brush 213 is connected with a resistance wire starting end 310 through an A wire 60, the B carbon brush 214 is connected with a resistance wire tail end 311 through a B wire 61, the A wiring terminal 50 is connected with the A copper ring 211 through a C wire 62, and the B wiring terminal 51 is connected with the B copper ring 212 through a D wire 63; the supporting device is provided with a probe assembly capable of sliding along the radial direction of the roller 30, the probe assembly and the resistance wire can be in electrical contact, and the probe assembly is connected with a C wiring terminal 52.
Specifically, the roller 30 is made of transparent material, the shaft 21 is further provided with a light source 70, and the light source 70 is preferably an LED light source.
Specifically, the supporting device comprises a base 10 and side supporting plates 20 arranged at two ends of the base 10, the side supporting plates 20 are arranged at two ends of the shaft 21, and the probe assembly slides along the axial direction of the roller 30 through a sliding rail 11 arranged at one side of the base 10.
Specifically, the probe assembly includes a slider 40 disposed on the slide rail 11, and a support bar 41 and a metal contact piece 42 sequentially connected with the slider 40, where the metal contact piece is directly contacted with the resistance wire 31.
Specifically, the length of the scale 32 is 800mm to 1100mm, preferably 1100mm.
The invention also claims a circuit connection mode based on the device, specifically, the A wiring terminal 50 is connected with the positive electrode of the power supply E, and the B wiring terminal 51 is connected with the electric key K 1 Is connected with the key K 1 A rheostat R is arranged between the power supply E and the transformer 0 The A wiring terminal is also connected with a current detector G which is connected with a tested power supply E X Or standard battery E 0 The tested power supply E X Or standard battery E 0 Through electric key K 2 Is in communication with the C terminal 52.
The invention also claims a potential difference calculation method based on a drum-type potential difference meter teaching aid for physical experiments, which comprises the following steps:
s1: connecting a test circuit in the manner of claim 6;
s2: electric key K 2 And a measured power supply E X Connecting;
s3: switch-on key K 1 ；
S4: rotating the roller handwheel 33 to cause the metal contact 42 to continuously slide over the resistance wire 30;
s5: observing the deflection condition of the pointer of the galvanometer G until the pointer of the galvanometer G points to the scale mark of 0, and stopping rotating the roller hand wheel 33;
s6: recording the scale value L of the position of the scale 32 where the metal contact 42 is located x Then E x ＝I 0 r 0 L x ；
S7: key K 2 And standard battery E 0 Connecting, repeating the steps S4-S6, and recording the scale value L of the position of the scale 32 where the metal contact piece 42 is positioned 0 Then E 0 ＝I 0 r 0 L 0 Wherein r is 0 For the resistance per unit length of the resistance wire, I 0 An operating current flowing through the resistance wire;
s8: combining the two formulas E x ＝I 0 r 0 L x And E is 0 ＝I 0 r 0 L 0 After division, the power supply E to be measured can be obtained X Electromotive force:
the above shows that the electromotive force E of the power supply to be measured X Standard battery E 0 L measured in the state of compensation of the potentiometer x And L 0 The value is determined.
Preferably, the standard battery E 0 Is 1.0186V.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (6)
1. A drum-type potentiometer teaching aid for physical experiments is characterized in that: comprises a supporting device and a measuring device,
the measuring device comprises a roller (30) and a shaft (21),
a resistance wire (31) is wound outside the roller (30), and a scale (32) is arranged along the winding direction of the resistance wire (31); two ends of the roller (30) are provided with a connecting terminal A (50) and a connecting terminal B (51),
an A copper ring (211) and a B copper ring (212) are arranged on the shaft (21), the A copper ring (211) is connected with an A carbon brush (213), the B copper ring (212) is connected with a B carbon brush (214), the A carbon brush (213) is connected with a resistance wire starting end (310) through an A lead (60), the B carbon brush (214) is connected with a resistance wire tail end (311) through a B lead (61),
the A wiring terminal (50) is connected with the A copper ring (211) through a C wire (62), and the B wiring terminal (51) is connected with the B copper ring (212) through a D wire (63);
the supporting device is provided with a probe assembly capable of sliding along the radial direction of the roller (30), the probe assembly can be in electrical contact with the resistance wire, and the probe assembly is connected with a C wiring terminal (52);
the roller (30) is made of transparent materials, and the shaft (21) is also provided with a light source (70);
the supporting device comprises a base (10) and side supporting plates (20) arranged at two ends of the base (10), the side supporting plates (20) are arranged at two ends of the shaft (21), and the probe assembly axially slides along the roller (30) through a sliding rail (11) arranged at one side of the base (10).
2. The drum-type potentiometer teaching aid for physical experiments as claimed in claim 1, wherein: the probe assembly comprises a sliding block (40) arranged on the sliding rail (11), a supporting rod (41) and a metal contact piece (42), wherein the supporting rod (41) and the metal contact piece (42) are sequentially connected with the sliding block (40), and the metal contact piece is directly contacted with the resistance wire (31).
3. A drum potentiometer teaching aid for physical experiments as claimed in claim 2, wherein: the length of the scale (32) is 800mm-1100mm.
4. A method of using a drum potentiometer teaching aid for physical experiments according to any one of claims 1-3, characterized in that: the use of the circuit connection is as follows,
the A wiring terminal (50) is connected with the positive electrode of the power supply E, and the B wiring terminal (51) is connected with the electric key K 1 Is connected with the key K 1 A rheostat R is arranged between the power supply E and the transformer 0 ；
The A wiring terminal is also connected with a current detector G which is connected with a tested power supply E X Or standard battery E 0 The tested power supply E X Or standard battery E 0 Through electric key K 2 Is communicated with the C wiring terminal (52).
5. A potential difference calculating method based on the drum type potential difference meter teaching aid for physical experiment according to any one of claims 1-3, characterized by comprising the steps of:
s1: connecting a test circuit in the manner of claim 4;
s2: electric key K 2 And a measured power supply E X Connecting;
s3: switch-on key K 1 ;
S4: rotating the roller hand wheel (33) to enable the metal contact piece (42) to continuously slide through the resistance wire (31);
s5: observing the deflection condition of the pointer of the galvanometer G until the pointer of the galvanometer G points to the scale mark of 0, and stopping rotating the roller hand wheel (33);
s6: recording the scale value of the position of the scale (32) where the metal contact (42) is locatedL X Then, the first and second data are obtained,E X =I 0 r 0 L X wherein, thereinr 0 Is a resistorThe resistance per unit length of the wire,I 0 an operating current flowing through the resistance wire;
s7: key K 2 And standard battery E 0 Connecting, repeating the steps S4-S6, and recording the scale value of the position of the scale (32) where the metal contact piece (42) is positionedL 0 ThenE 0 =I 0 r 0 L 0 Wherein the method comprises the steps ofr 0 Is the resistance per unit length of the resistance wire,I 0 an operating current flowing through the resistance wire;
s8: the two types are combinedE X =I 0 r 0 L X AndE 0 =I 0 r 0 L 0 after division, the power supply E to be measured can be obtained X Electromotive force:
E X= L X ÷ L 0 ×E 0
the above shows that the electromotive force E of the power supply to be measured X Standard battery E 0 Is measured with the potentiometer in a compensated stateL X AndL 0 the value is determined.
6. The potential difference calculating method based on the drum type potential difference meter teaching aid for physical experiment according to claim 5, wherein the standard battery E 0 Is 1.0186V.
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| CN201810625212.7A CN108510856B (en) | 2018-06-17 | 2018-06-17 | Drum-type potentiometer teaching aid for physical experiment and application method thereof |
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| CN201810625212.7A CN108510856B (en) | 2018-06-17 | 2018-06-17 | Drum-type potentiometer teaching aid for physical experiment and application method thereof |
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| CN108510856B true CN108510856B (en) | 2023-11-24 |
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