"Measurement of Resistance" Ohm's Law PPT download

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"Measurement of Resistance" Ohm's Law PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point: Measurement of resistance

1. In the experiment of "Measurement of Resistance by Voltammetry", the voltmeter indicates 4.8 V, and the ammeter pointer is as shown in the figure. The ammeter reads 0.32 A, and the resistance of the measured resistor is 15 Ω.

2. Xiaoying designed a circuit as shown in Figure A to measure the resistance of a fixed-value resistor. The power source used was two dry batteries. Please point out a problem in his circuit design or connection: the lack of a sliding rheostat; after correction, the image drawn using the measured data is shown in Figure B. The resistance of the resistor under test is 5Ω.

3. In the experiment of "voltammetric resistance measurement", which of the following statements is incorrect (B)

A. When connecting the experimental circuit, the switch should be turned off

B. When measuring, you only need to measure a set of data

C. Before using the meter, select the range and adjust it to zero.

D. When connecting the sliding rheostat, the slider should be placed at the maximum resistance point of the connected circuit.

4. In the experiment of "measuring the resistance of a small light bulb with an ammeter and voltmeter", the role that the sliding rheostat cannot play is (B)

A.Change the current in the circuit

B. Change the size of the resistance being measured

C. Change the voltage across the resistor being measured

D. Protection circuit

Resistance measurement PPT, part 2: improvement of comprehensive capabilities

5. As shown in the figure is part of the circuit of "voltammetry resistance measurement". If the influence of the resistance of the ammeter and voltmeter on the measurement results is considered, the ratio of the indications of the voltmeter and the ammeter is equal to (C)

A. Resistance of ammeter

B. Resistance of voltmeter

C. The total resistance of the voltmeter and the resistance to be measured in parallel

D. The total resistance of the ammeter and the resistance to be measured in series

6. Xiao Ming practiced using the "voltammetry method" to measure resistance. The resistance of the resistance he measured was about 2 Ω, the range of the voltmeter was 0~3 V, and the range of the ammeter was 0~3 A. After the measurement, he got The conclusion is that the resistance of the resistor to be measured is 10 Ω, then the error he made in the measurement may be (C)

A. The voltmeter and ammeter are connected in reverse positions.

B. He did not take multiple measurements and average them, resulting in excessive errors.

C. The voltmeter reads in the 15 V range, and the ammeter reads in the 3 A range.

D. The voltmeter reads in the 15 V range, and the ammeter reads in the 0.6 A range.

7. In the "voltammetric resistance measurement" experiment as shown in the figure, when switch S is closed, Xiaoli finds that the ammeter has a reading, but the reading is small, and the small bulb does not light up. The next operation should be (D )

A. Replace a small light bulb with the same specifications

B. Change the range used by the voltmeter

C. Check whether there is an open circuit fault in the circuit

D. Reduce the resistance of the sliding rheostat connected to the circuit

8. Xiao Ming uses "voltammetry" to measure the resistance of a fixed value resistor Rx (about 20 Ω). Experimental equipment: fixed value resistor Rx, voltmeter (range 0~3 V and 0~15 V), ammeter (range 0~0.6 V and (A), sliding rheostat (20 (A)), switch, and student power supply. Some wires.

(1) The principle of measuring resistance by "voltammetry" is Ohm's law;

(2) As shown in Figure a, it is an experimental circuit diagram for measuring resistance by "voltammetry". In the figure, A and B are two electric meters, of which A is a voltmeter;

(3) The power supply voltage of this experiment is 12 V, the voltmeter should be in the 0~15 V range, and the ammeter should be in the 0~0.6 A range. When connecting the ammeter as shown in Figure b, the current should flow from the "0.6" terminal into the ammeter. ;

(4) After closing the switch, it is found that the voltmeter indicates about 6 V and the current indicates zero; when the sliding rheostat slide is moved, the voltage indication changes significantly, but the current indication is always zero, then the component is faulty. Probably an ammeter;

(5) After troubleshooting, connect the line and move the sliding varistor slide. When the ammeter indicates as shown in Figure b, the current through the resistor Rx is 0.34 A;

(6) After many measurements, Xiao Ming drew the U-I image as shown in Figure c based on experimental data. It can be seen from the image that the resistance Rx = 22.2Ω (retaining 1 decimal place).

Measurement of resistance PPT, part 3: Expansion of research and breakthroughs

10. (Henan High School Entrance Examination) Xiaofang uses the circuit shown in Figure A to measure the resistance of the unknown resistor Rx. The resistance is about 5 Ω.

(1) Please use strokes instead of wires to complete the connection of the experimental circuit in Figure B according to the circuit diagram;

(2) Before closing the switch, the slider of the sliding rheostat should be placed at terminal B (optional "A" or "B");

(3) Close the switch and find that the voltmeter and ammeter have no indication. Xiaofang used another intact voltmeter for testing. She connected the voltmeter between a and b and between b and c respectively. The voltmeter showed a reading. When she connected it between a and c, the voltmeter showed no indication. number. If the circuit connections are intact and only one component is faulty, the fault is a "sliding rheostat open circuit";

(4) After troubleshooting, adjust the sliding rheostat and record multiple sets of data. The I-U image of the resistance Rx to be measured is drawn, as shown in Figure C. From the image, we can get Rx = 4Ω;

(5) Xiaofang designed another solution and also measured the resistance of Rx. The circuit is shown in Figure D. R0 is a fixed-value resistor with a known resistance, and the power supply voltage is unknown and constant. The measurement steps are as follows:

①When switch S1 is closed and S2 is open, the ammeter reading is I1;

②When switches S1 and S2 are both closed, the ammeter reads I2;

③The resistance to be measured Rx= ("( " I_2 "-" I_1 " )" R_0)/I_1 (expressed by known and measured physical quantity symbols).

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For more information about the "Ohm's Law Measurement of Resistance" PPT courseware, please click the Ohm's Law ppt Measurement of Resistance ppt tag.

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Update Time: 2024-10-02

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