"Measurement of Current" Current and Circuit PPT

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"Measurement of Current" Current and Circuit PPT

Part One Content: A Classification Practice of Knowledge Key Points

Knowledge point 1: The strength of electric current

1. In physics, electric current represents the ______ of electric current, its symbol is ______, and its SI unit is ______; smaller units include ________ and ________, whose symbols are ________ and ________ respectively.

2. Unit conversion:

(1)500 μA=________mA=________A.

(2)0.3 A=________mA=________μA.

3. Figure 15-4-1 shows common household appliances. Regarding their current during normal operation, the following statements are reasonable: ()

A. Electric fan approx. 2 A

B． Refrigerator about 1 A

C. Rice cooker approx. 0.8 A

D． Microwave oven approx. 10 A

Knowledge point 2: Measurement of current

4. When using the ammeter, you must pay attention to:

(1) Before use, observe its _____ and ______, and check whether the pointer of the meter is aligned with ______.

(2) The ammeter must be connected to the circuit being measured.

(3) Before connecting the ammeter to the circuit, you should first estimate the size of the current in the circuit. If you cannot estimate the size of the current, you can use the "test touch method" to make a judgment. That is, first connect the meter to the circuit using the _____ range, and test the pointer. deflection situation. If the deflection angle of the pointer is small, it is best to use __________ for measurement.

(4) The measured current should flow into the ___________ terminal of the ammeter and flow out from the __________ terminal.

(5) It is absolutely not allowed to directly connect the two terminals of the ammeter to the two poles of the power supply without going through __________.

(6) Ammeters commonly used in laboratories usually have ______ binding posts and ______ ranges, which are ________A and ________A, and the corresponding graduation values ​​are ________A and ________A respectively. Before reading, observe the selected ________ and make sure the ________ corresponding to the range.

(7) As shown in Figure 15-4-2, the indication of ammeter A is ________, and the indication of ammeter B is ________.

5. As shown in Figure 15-4-3, after closing the switch, the ammeter measures ()

A. Current through lamp L1

B． Current through lamp L2

C. Current through lamps L1 and L2

D． The sum of the currents through lamps L1 and L2

6. In the following circuit, the ammeter measures the current in lamp L1 ()

7. According to the circuit diagram shown in Figure 15-4-5A, use stroked lines instead of wires to connect the physical circuit (it is required that the wires cannot cross).

Current measurement PPT, part 2: Comprehensive practice of the B-law method

8. As shown in Figure 15-4-6, M and N represent the two terminals of an ammeter, and a, b, c, and d represent the four connection points in the circuit. If you want to use this ammeter to measure the current passing through the small light bulb, Then the correct one of the following connection methods is ()

A. M connects to a, N connects to b

B． M is connected to d, N is connected to a

C. M is connected to c, N is connected to a

D． M is connected to d, N is connected to b

9. For the circuit shown in Figure 15-4-7, which of the following statements is correct ()

A. L1, L2 connected in series

B． Switch S only controls L2

C. Ammeter measures current in main circuit

D． Ammeter measures the current in L1

10. As shown in Figure 15-4-8, Xiaoqiang carelessly connected the ammeter in parallel to both ends of lamp L1. If the switch is closed at this time, the phenomenon that will definitely occur is ()

A. The power supply is burned out

B． Ammeter damaged

C. Lamp L1 does not light up

D． Lamp L2 does not light up

11． Figure 15-4-9 shows what happened when three students used the ammeter. It can be seen that the reason for A is _______________, the reason for B is ____________________, and the reason for C is _______________________________________________.

12. As shown in Figure 15-4-10, it is an ammeter commonly used in laboratories. Its zero scale is not at the leftmost end of the dial. When wires a and b are connected to the terminals marked "-" and "3" respectively, the ammeter pointer deflects as shown in the figure. At this time, the current flows from the wire ______ (optional "a" or "b") into the ammeter, and its indication is ______A. In order to increase the deflection angle of the pointer and thereby reduce the reading error, wire a should be connected to the terminal marked "______", and wire b should be connected to the terminal marked "______".

Current Measurement PPT, Part 3 Content: Practical Practice of C High Frequency Examination Questions

15． [2017·Huaihua]In Figure 15-4-13, the circuit that can directly measure the current through lamp L1 is ()

16． [2017·Jining]In the circuit shown in Figure 15-4-14, when the switch is closed, which of the following statements is correct ()

A. Two light bulbs in series

B． The switch can only control light L1

C. The ammeter measures the current through bulb L1.

D． Direction of current flow from ammeter to switch

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Update Time: 2024-11-16

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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