"Voltage" Voltage Resistance PPT Free Courseware

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"Voltage" Voltage Resistance PPT Free Courseware

Part One Content: A Classification Practice of Knowledge Key Points

Knowledge point 1 Voltage

1. Voltage is the cause of ________, that is, voltage causes free charges in the circuit to ____________ to form current. ________ is the device that provides voltage. Voltage is represented by the letter ________.

2. The conditions for obtaining continuous current in a circuit are: there must be ______ in the circuit (or _________ at both ends of the circuit), and the circuit is ________.

3. The international unit of voltage is ________, referred to as ______, and is represented by the symbol ______. In addition, commonly used units include ________ and ________.

4. Complete the following unit conversions.

(1)48 V=________kV=________mV;

(2)22 V=________kV; (3)350 kV=________V.

5. Correctly fill in the following special voltage values.

(1) The voltage of a new dry cell battery is U = ________V.

(2) The voltage of a lead-acid battery U = ________V.

(3) The voltage of household lighting circuit U=________V.

(4) The voltage that is safe for the human body should not be higher than ________V.

Knowledge point 2: Voltage measurement

6． Before using the voltmeter, observe its ________ and ________. The voltmeter should be connected to the electrical appliance under test _________ so that the current flows in from its ________ terminal and flows out from the ________ terminal; the voltmeter ________ (optional "can" or "cannot") be connected directly at both ends of the power supply.

7． As shown in Figure 16-1-1, if the 0~3 V range is selected, the reading of the voltmeter is ________V. If the 0~15 V range is selected, the reading of the voltmeter is ________V. It can be seen that when the pointer deflection is the same, a large number of The reading of the range is ________ times the reading of the small range.

8. When Xiao Ming uses a voltmeter to measure voltage, the connection method of the voltmeter terminals is shown in Figure 16-1-2. The following is the opinion of the students in the same group. The correct opinion is ()

A. The measuring range of this voltmeter is 3~15 V

B． This voltmeter can measure the voltage value

C. This voltmeter does not have a positive terminal

D. This voltmeter cannot measure the voltage value

Voltage PPT, part 2 content: Comprehensive practice of B-law method

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

A． Voltage is what causes current in a circuit

B． A power supply is a device in a circuit that provides voltage

C. If there is current in the circuit, there must be voltage across the circuit

D. If there is voltage across the circuit, there must be current in the circuit

11. If an electrical experiment cannot be carried out normally and it is necessary to determine whether the dry battery is scrapped, you can use a voltmeter to measure its voltage. The correct one of the following steps is ()

① Contact the positive terminal of the voltmeter with the negative terminal of the dry cell, and the negative terminal with the positive terminal. ② Read the voltage value on the dial. ③ Select the range of the voltmeter as 0~3 V. ④ Connect the positive terminal of the voltmeter to the positive terminal of the battery. The positive terminal is in contact, and the negative terminal is in contact with the negative terminal ⑤ Select the range of the voltmeter to be 0 ~ 15 V

A． ③②① B. ①②⑤ C. ③④② D. Can not be measured

12. In the circuit shown in Figure 16-1-4, A and B are two electricity meters. After closing the switch S, the two light bulbs are connected in series. The correct one of the following statements is ()

A． A is an ammeter, B is a voltmeter

B． A and B are both voltmeters

C. A is a voltmeter and B is an ammeter.

D. A and B are both ammeters

13. When Xiao Ming measured the voltage across the bulb L1, he accidentally connected the voltmeter in series with L1, as shown in Figure 16-1-5. Which of the following statements is correct ()

A． Bulbs L1 and L2 are both on, but the voltmeter has no indication.

B． Bulbs L1 and L2 are not on, but the voltmeter shows a reading.

C. Bulbs L1 and L2 are both on, and the voltmeter shows a reading.

D. Bulbs L1 and L2 are not on, and the voltmeter has no indication.

Voltage PPT, the third part of the content: Practical practice of C high-frequency examination questions

18. [2017·Yunnan] Xiaoya accidentally exchanged the positions of the voltmeter and ammeter when doing electrical experiments, as shown in Figure 16-1-10. If the switch is closed at this time, but()

A． Both watches may be burned out

B． Neither watch will be burned out

C. The ammeter will not be burned out

D. The voltmeter will not be burned out, the ammeter may be burned out

19． [2017·Yichang]Immerse two different metal sheets A and B in salt water. This is a battery. When the battery supplies power to the outside world, it converts __________ energy into electrical energy; put the metal sheet A , B are respectively connected to the terminals of the voltmeter with wires. If the pointer of the voltmeter deflects as shown in Figure 16-1-11, then the metal piece A is the ______ (optional "positive" or "negative") pole.

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Update Time: 2024-10-21

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