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Electromagnetic law exploration experimental apparatus and experimental method thereof

An experimental method and technology of experimental apparatus, which can be applied in the direction of instruments, educational appliances, teaching models, etc., and can solve the problems of waste of resources, inconvenient use, transportation and storage, etc.

Active Publication Date: 2015-08-26
周培宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The three experiments of power-on self-inductance, power-off self-inductance, and exploring the relationship between the voltage at both ends of the transformer coil and the number of turns were completed using different experimental devices. Three coils were used, resulting in waste of resources
[0005] 2. The school's existing 2446 self-inductance phenomenon demonstrator weighs more than ten kilograms, which is not easy to use, transport and store

Method used

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  • Electromagnetic law exploration experimental apparatus and experimental method thereof
  • Electromagnetic law exploration experimental apparatus and experimental method thereof
  • Electromagnetic law exploration experimental apparatus and experimental method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Embodiment 1 Explore the generation conditions of induced current: imitate Faraday's experiment.

[0118] "Mimicking Faraday's experiment" circuits such as figure 2 shown. The experimental steps are as follows:

[0119] In the first step, the power supply 205 is a No. 5 dry battery, and the terminal ten 010 is connected with the terminal three 003 by a wire, the terminal nineteen 019 is connected with the terminal zero 000, and the terminal one 001 is connected with the terminal nine 009;

[0120] In the second step, connect terminal 13 013 and terminal 14 014 with the positive and negative terminals of the ammeter 700 respectively with wires, turn the selection knob of the ammeter 700 to the 10mA position, and turn the zero adjustment knob to align the pointer with the scale the middle zero point on the plate;

[0121] At this time, the effective circuit is: power supply 205, switch 2 204, potentiometer 1 103, coil 2 502 form a series circuit, coil 3 503 and ammete...

Embodiment 2

[0130] Embodiment 2 Explore the method of determining the direction of the induced current.

[0131] image 3 It is a schematic diagram of the experimental circuit and operation method. The NdFeB strong magnet has a diameter of 1.2cm and a thickness of 1.5cm, and is installed in a transparent cylinder (the base of the cylinder is thicker, and the magnet can be lifted by hand when it is sucked by the transformer 500). The terminal zero 000 and terminal one 001 at both ends of the 506T coil two 502 are respectively connected to the + and - terminals of the ammeter 700. The range of the ammeter 700 is selected to be 300μA, and the test contact method is used in advance to confirm that when the current flows from the + terminal into the ammeter 700, The pointer deflects to the right. Move the magnet close to or away from the transformer (coil) according to the 4 situations in the figure, and observe the deflection direction of the ammeter 700 pointer.

[0132] Prompt for explora...

Embodiment 3

[0134] Example 3 Explore the influence of the change speed of magnetic flux on the magnitude of the induced current

[0135] The experimental circuit and operation method are also as image 3 As shown, but in each case, when moving the magnet, one should move quickly and the other slowly. During the movement, pay attention to the maximum deflection angle of the ammeter 700 pointer.

[0136] Prompt for exploration: Note the maximum deflection angle of the ammeter 700 needle when comparing "fast movement" with "slow movement".

[0137] Exploration purpose: To find out that the faster the magnetic flux passing through the closed circuit changes, the greater the induced electromotive force and the greater the induced current in the loop (the resistance of the loop remains constant), so as to lay the experimental foundation for understanding Faraday's law of electromagnetic induction.

[0138] Series 2 A series of exploratory experiments on self-induction phenomena

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Abstract

The invention relates to an electromagnetic law exploration experimental apparatus and an experimental method thereof and belongs to the electromagnetic variable measurement technical field. The electromagnetic law exploration experimental apparatus comprises a bottom plate and a vertical plate; the rear part of the bottom plate is connected with the dismountable vertical plate; the bottom plate is provided with a power source adapter, a linear Hall element, a transformer, a potentiometer Two and a current meter; 220V alternating current is inputted to the input end of the power source adapter; alternating current and direct current are outputted front the output end of the power source adapter; a millivoltmeter is connected in parallel with two opposite sides of the linear Hall element; the transformer includes a coil One, a coil Two and a coil Three; and the vertical plate is connected with two sets of circuits which are respectively are an electrification self-induction circuit and a de-electrification self-induction circuit. The electromagnetic law exploration experimental apparatus has the advantages of a large number of functions, wide use range, excellent experimental effects and low cost.

Description

technical field [0001] The invention belongs to the technical field of measuring electromagnetic variables, and in particular relates to an experimental device for exploring electromagnetic laws and an experimental method thereof. Background technique [0002] The power-on self-inductance and power-off self-inductance experiments are one of the most classic experiments in high school physics, and they must be done in the classroom. Decades ago until now, middle school physics laboratories are equipped with 2446-type self-induction phenomenon demonstrators, which use two independent devices to conduct power-on self-inductance and power-off self-inductance experiments, and can observe The 3.8V small electric bead flickers and goes out. Because there is no other choice, the majority of teachers have always used the 2446 self-induction phenomenon demonstrator to do self-induction experiments. What they think about is how to operate proficiently and standardizedly in classroom e...

Claims

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Application Information

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IPC IPC(8): G09B23/18
CPCG09B23/181
Inventor 周培宇
Owner 周培宇
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