"Measurement of Current" Current and Circuit PPT courseware download

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"Measurement of Current" Current and Circuit PPT courseware download

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The strength of electric current

1. The current in the room light bulb is about 0.2 A, equal to 200 mA; the current in the semiconductor radio power supply is about 50 mA, equal to 5×104 μA.

2. Among the following statements about current, which one is incorrect (A)

A. Current is a physical quantity that expresses the speed of electric current.

B. Electric current is a physical quantity that expresses the strength of electric current.

C. The unit of current is ampere, and its symbol is A.

D. Current is usually represented by I, and the unit can be milliamps or microamps.

3. Among the following household appliances, the one with the highest current during normal operation is (C)

A. Washing machine B. Television

C. Air conditioner D. Refrigerator

Knowledge point 2: Measurement of current

4. As shown in the figure is a schematic diagram of a common ammeter in the laboratory. Please write down two pieces of information obtained from the figure: ① The selected range of the ammeter is 0~3 A; ② The indication of the ammeter is 1.5 A.

5. Regarding the use of ammeter, which of the following statements is correct (A)

A. Before using the ammeter, you need to check whether the pointer is pointing at the zero scale line.

B. Current must flow in from the “-” terminal and flow out from the “+” terminal

C. The ammeter can be used beyond the range.

D. The graduation value of the "0~0.6 A" range is 0.1 A

6. In the circuit shown in the figure, the ammeter measures (B)

A. Current through lamp L1

B. Current through lamp L2

C. Current through lamp L1 and lamp L2

D. All three of the above are possible

Current measurement PPT, part 2: improvement of comprehensive capabilities

7. As shown in the picture, it is a circuit composed of a small light bulb, an LED light, two dry batteries, and a switch. When the switch is closed, both the small bulb and the LED light emit light. At this time, the current flowing through the small bulb is approximately 0.25 A, which is equal to 250 mA. Connect a wire to both ends of the small bulb. You will see that the small bulb goes out, but the LED light is still glowing. The experimental phenomenon shows that the small light bulb is "short-circuited" and goes out.

8. As shown in the figure is the dial of an ammeter commonly used in experiments. Before connecting the circuit, Xiao Ming found that the pointer deflected as shown in Figure a. The next operation he should perform was to zero-adjust the ammeter. When the circuit was connected and the switch was closed, he found that the ammeter pointer deflected as shown in Figure b. In order to reduce the Due to the small measurement error, the improvement that should be made is to change the measurement range to 0~0.6 A.

9. As shown in the figure, when students in a physics interest group use an ammeter to measure the current of a small light bulb, they connect the wire ends M and N to the terminal marked "0.6" on the ammeter. At this time, the ammeter measures the lamp L1. If you want to use an ammeter to measure the total current in the main circuit, the wire end M should be connected to the "3" terminal of the ammeter, and the wire end N should be connected to the "-" terminal of the ammeter.

10. Point out the errors in the circuit shown in the picture:

(1)Lamp L2 is not connected to the circuit;

(2) The ammeter and lamp L1 are connected in parallel;

(3)Power supply short circuit.

Current Measurement PPT, Part 3: Expanding Research and Breakthroughs

17. (Anhui High School Entrance Examination) In a certain electrical experiment, it is known that the dual-range ammeter used can meet the measurement requirements of the experiment. When the current cannot be estimated in advance, in order to avoid damaging the ammeter and more accurately measure the current in the circuit, the range of the ammeter is often determined by "test touch".

(1) If the small range of the ammeter is selected first: close the switch and then quickly open it, and at the same time observe the pointer deflection of the ammeter at the moment the switch is closed. If the pointer deflection exceeds the maximum value, switch to the large range of the ammeter;

(2) If you first select the large range of the ammeter: close the switch and then quickly open it, and at the same time observe the deflection of the ammeter's pointer at the moment the switch is closed, if the pointer deflection is small, switch to the small range of the ammeter.

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For more information about the "Measurement of Current and Circuit Current" PPT courseware, please click the "Measurement of Current in Current and Circuit ppt" ppt tag.

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Update Time: 2024-10-03

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