"Measurement of Resistance" Ohm's Law PPT Courseware 5

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"Measurement of Resistance" Ohm's Law PPT Courseware 5

Consider the following questions:

1. Can you design a circuit that can be used to measure resistance? Please draw the circuit diagram.

2. What is the experimental principle you envision?

1. Measure resistance by voltammetry

1. Experimental principle: R=U/I

2. Experimental equipment: power supply, wires, switches, resistance to be measured, voltmeter, ammeter, sliding rheostat

3. Experimental circuit diagram:

Experiment 1: Measuring the resistance of a fixed-value resistor

Experimental steps

1. Turn off the switch and connect the physical circuit according to the circuit diagram.

2. Close the switch and adjust the slider of the sliding rheostat so that the voltmeter indicates 1V, 2V, and 3V respectively. Read and record the corresponding current and fill it in the table.

3. Calculate the resistance value each time and find their average value and record it in the table.

4. After the experiment is over, organize the experimental equipment.

Experimental steps

1. Turn off the switch and connect the physical circuit according to the circuit diagram.

2. Close the switch and move the slider to make the lamp glow normally (2.5V), dimly (2V), or strongly (3V). Read the readings of the ammeter and voltmeter, and record them in the table.

3. Calculate the resistance of the light bulb when it emits light at different voltages and record it in the table, and analyze the reasons for the different resistances.

4. After the experiment, organize the experimental equipment.

Example 3 In the experiment of "Measuring the resistance of a small light bulb", a student accidentally connected the ammeter and voltmeter in the wrong position when connecting the circuit, as shown in the figure. Possible phenomena when closing the switch are ( )

A. The ammeter is burned out and the voltage indication is 0

B． Small light bulb burned out

C. The current representation number is 0, and the voltage representation number is the power supply voltage value.

D. The current representation number is 0, and the voltage representation number is 0

1. Student Xiaodong did an experiment of "measuring the resistance of a small light bulb":

(1) Please complete the connection of the experimental circuit as shown in the figure;

(2) After Xiaodong correctly connects the circuit, close the switch and adjust the sliding rheostat so that the voltmeter reads as shown in Figure (A). At this time, the ammeter reads as shown in Figure (B). The resistance of the small light bulb is _____Ω .

2. Xiaodong did an experiment to measure the resistance of a light bulb. After connecting the circuit and closing the switch, he found that the light did not light up, the ammeter showed no reading, and the voltage indicated was the power supply voltage. What are the possible causes of the failure?

Please write down three reasons why the light bulb does not light up.

(1) The voltmeter is connected in series in the circuit;

(2) The small light bulb is broken;

(3) The wire or terminal connecting the two ends of the small bulb is broken.

Experiment 3: Observe the phenomenon of open circuit and short circuit at the light bulb.

Expand experiments

Turn off the switch, adjust the resistance of the sliding rheostat to the maximum, and connect the voltmeter to the large range;

1. Break the circuit: remove the bulb, close the switch, and observe the phenomenon;

2. Short circuit: Connect both ends of the bulb with wires, close the switch, and observe the phenomenon;

3. The light bulb does not light up, the ammeter has a reading, but the voltmeter has no reading (it is 0);

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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.

"Measurement of Resistance" Ohm's Law PPT courseware 4:

"Measurement of Resistance" Ohm's Law PPT Courseware 4 Learning Objectives 1. Further master the method of using voltmeters and ammeters 2. Learn to use voltammetry to measure resistance 3. Deepen the understanding of Ohm's law and its application Think about how to use Ohm The law is found to indirectly measure conductors..

"Measurement of Resistance" Ohm's Law PPT courseware 3:

"Measurement of Resistance" Ohm's Law PPT Courseware 3 Review the past and learn the new 1. The voltmeter connected in parallel at both ends of the wire shows: 2. The voltmeter connected in series in the circuit shows: 1. Three basic physical quantities of the circuit: Physical quantity: current I, Measuring Tool: Ammeter (Ammeter)..

"Measurement of Resistance" Ohm's Law PPT Courseware 2:

"Measurement of Resistance" Ohm's Law PPT Courseware 2 Want to Discuss What basic physical quantities have we learned in electrical knowledge so far? How are these physical quantities measured? From Ohm's law I=U/R, it can be deduced that R=U/I. It can be seen that through the measurement of current and voltage..

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Update Time: 2024-08-06

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