"Voltage" Voltage resistance PPT free download

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"Voltage" Voltage resistance PPT free download

Reaching standards and consolidating

1. Multiple choice questions

1. Which of the following statements is correct ()

A． International units of voltage include volts, kilovolts, millivolts, microvolts, etc.

B． Experience has proven that voltages higher than 36 V are safe for the human body

C. The normal working voltage of the washing machine is 220 V

D. The voltage of a new dry cell battery is 2 V, which equals 2×103 mV

2. Regarding voltage, which of the following statements is incorrect ()

A． A power supply is a device that provides voltage

B． Voltage is what causes current to form

C. When there is voltage in a circuit, there must be current

D. Different power supplies generally provide different voltages

3. Figure 12-K-1 is a circuit that uses a voltmeter to measure the voltage at both ends of the light bulb. The correct way to use the voltmeter is ()

4. In the circuit shown in Figure 12-K-2, when the switch S is closed, the voltmeter measures the voltage across both ends ()

A． L1 B. L2

C. Power supply D. Power and L1

5. Figure 12-K-3 shows the electrical meter in a certain circuit. Which of the following readings is correct ()

A． The ammeter shows 2.3 A

B． The voltmeter reads 13 V

C. The reading on the ammeter is 2.3 V

D. The voltmeter reads 2.3 V

6． When using a voltmeter that has been zeroed to measure the voltage at both ends of different conductors, after closing the switch, the voltmeter will appear in the following four situations: ① The selected range is too large; ② The selected range is too small; ③ The positive and negative terminals Reverse connection; ④The measured voltage is too high. Then the order of the pointer deflection of the voltmeter shown in Figure 12-K-4 corresponding to the above four situations ①②③④ is ()

A． D, C, A, B

B． B, C, D, A

C. C, D, B, A

D. D, B, A, C

7． Shown in Figure 12-K-5 is a tomato battery made by Xiao Ming. Copper and zinc sheets are inserted into the tomato at a certain distance to form a tomato battery. Connect the copper and zinc sheets to the voltmeter as shown in the figure. Which of the following statements is correct ( )

A． Zinc flakes are the positive electrode of tomato batteries

B． Electrons flow from the copper plate to the zinc plate through the voltmeter

C. The voltage of this tomato battery is 4 V

D. Tomato battery converts chemical energy into electricity

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Update Time: 2024-07-02

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