"Measurement of Resistance by "Voltampere Method"" Exploring Circuit PPT Courseware

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"Measurement of Resistance by "Voltampere Method"" Exploring Circuit PPT Courseware

Experimental exploration: measuring the resistance of a light bulb when it is working

(1) Ask the question: How to measure the resistance of a conductor using __________ meter and __________ meter?

(2)Method:_____.

(3)Principle:_____.

(4) The circuit diagram is shown in the figure.

(5) Equipment: battery pack, small light bulb, one each of __________, __________, __________, switch, and some wires.

(6)Experimental steps

Measuring resistance using "voltammetry"

1. Principle: R=U/I

2. Precautions: (1) When connecting the circuit, turn off the switch, and pay attention to the selection and correct connection of the voltmeter and ammeter range; (2) Before closing the switch, adjust the rheostat to the maximum resistance value to achieve protection. The purpose of the circuit; (3) During the experiment, the voltage and current of the resistance to be measured are changed multiple times by adjusting the sliding rheostat, and multiple sets of different experimental data are obtained, so as to reduce the experimental error by averaging.

(2) Please use pen lines instead of wires to completely connect the physical circuit in Figure A.

(3) Before closing the switch, the slider P of the sliding rheostat should move to the _____ (fill in "A" or "B") end. After Xiaoqing closes the switch and moves the slider P to a certain point, the current value is 0.2 A, the voltage value is _____V as shown in Figure B, and the calculated resistance value is _____Ω.

(4) Xiaoqing only takes the resistance value measured in this experiment as the final result. Do you think it is appropriate? __________, the reason is _____.

(5) As shown in Figure C, it is the I U image made by the other two groups of students based on the measured data. Analysis of the image shows that Ra_____ (fill in ">", "=" or "<") Rb.

(6) After Xiaozhen connected the circuit and closed the switch, she found that no matter how she moved the slider P of the varistor, the voltmeter and ammeter showed no change, but they did not change. The reason may be _____. (Just write one)

Tips: This question examines the measurement of resistance by voltammetry. When solving this question, pay attention to reading the I U image and use the method of controlling variables: you can use the same voltage to compare the current, or you can use the same current to compare the voltage method to compare the two resistors. size.

1. In the experiment of "measuring resistance by voltammetry", which of the following operations has problems ()

A. During the process of connecting the line, the switch should be in the off state

B. During the process of connecting the lines, the sliding blade of the sliding rheostat should be placed at the position of maximum resistance.

C. The ammeter is connected in series in the circuit under test, and the voltmeter is connected in parallel across the resistor under test.

D. During the test, it is found that the ammeter pointer deflects in the opposite direction and the voltmeter is normal. You only need to disconnect the circuit and reverse the positive and negative poles of the battery.

2. In a physical, chemical and biological experiment skills test, the equipment prepared in the laboratory includes: power supply, voltmeter, ammeter, sliding rheostat, switch, resistance to be measured and several wires. When doing an experiment to measure resistance, Xiao Ming accidentally reversed the positions of the voltmeter and ammeter while connecting the circuit, but the other connections were correct. What happens when the switch is closed in this circuit is ()

A. The ammeter has a reading and the voltmeter has a reading of almost zero.

B. The voltmeter will be burned out

C. The voltmeter has a reading and the ammeter has a reading of almost zero.

D. The ammeter will be burned out

3. Xiao Ming designed and connected the circuit for measuring resistance as shown in Figure A. The power source used was two dry batteries. Please point out a problem in his circuit design or connection: ____________; After correction, the measured data plotted as shown in Figure B, the resistance of the resistor to be measured is __________Ω.

4. The following is an experimental report written by Xiao Ming after completing the experiment. Please help him complete it.

[Experiment name] Voltammetric measurement of resistance

[Experimental Principle] R=U/I

[Experimental Equipment] Please draw the required equipment using the specified circuit device symbols in the dotted box (warm reminder: there is no need to draw a circuit diagram).

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For more information about the PPT courseware "Exploring Circuit Voltammetry to Measure Resistance", please click the Explore Circuit ppt Voltammetry to Measure Resistance ppt tag.

"Measurement of Resistance by "Voltampere Method"" Exploring Circuit PPT Courseware 3:

"Measurement of Resistance by Voltammetry" Exploration Circuit PPT Courseware 3 So far, what physical quantities have we learned so far about the electrical knowledge we have learned? How to measure the resistance of a small light bulb I =U/R R=U/I R=U/I means that the resistance of the conductor is numerically equal to the voltage applied to both ends of the conductor and the voltage passed through..

"Measurement of Resistance by "Voltampere Method"" Exploring Circuit PPT Courseware 2:

"Measurement of Resistance by Voltammetry" Exploration Circuit PPT Courseware 2 There is a resistor with an unknown resistance in the laboratory. How to measure its resistance? Pass a current through the resistor, measure the current value and the voltage across the resistor, and apply Ohm's law to find the value of Rx. Use voltammetry...

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Update Time: 2024-07-20

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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