《Voltage》Voltage resistance PPT

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《Voltage》Voltage resistance PPT

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Voltage

1. The units of voltage include volt (V), kilovolt (kV), and millivolt (mV). The conversion relationship between them is 1 kV=　103　V=　106　mV.

2. Which of the following statements is correct (A)

A. The voltage of one AA dry cell battery is 1.5 V

B. The voltage that is safe for the human body is not higher than 63 V

C. The voltage of the household circuit is 380 V

D. The voltage of the battery (battery) in the car is 2 V

3. Among the following statements about voltage, which one is correct (C)

A. There is current in a circuit, but there may not necessarily be voltage at both ends of it.

B. Voltage will definitely cause the electrons of the object to move continuously

C. In nature, some animals can generate voltage themselves for self-defense.

D. The power supply is a device that provides voltage. The voltages provided by different power supplies must be different.

Knowledge point 2: Voltage measurement

4. (Enshi Prefecture High School Entrance Examination) As shown in the figure, the voltmeter indicates 4V.

5. As shown in the figure, a voltmeter is used to measure the voltage at both ends of the small light bulb L. The correct connection method is (D)

6. Which of the following methods of using a voltmeter do you think is wrong (C)

A. When the measured voltage cannot be estimated in advance, a large range should be used for "test touch"

B. When wiring, the current must flow in from the “+” terminal and flow out from the “-” terminal.

C. The voltmeter cannot be directly connected to both ends of the power supply when in use.

D. The voltage of a dry battery can be measured using the large or small range of the voltmeter.

Voltage PPT, part 2: improvement of comprehensive capabilities

7. When a classmate used a voltmeter with two ranges (0~3 V and 0~15 V) to measure the voltage of a battery pack composed of two old dry cells connected in series, the recorded result was 10 V. The reason for his error I misjudged the voltmeter range when reading, and the actual voltage was 2V.

8. Lamp L1 and lamp L2 are connected in series. First use a voltmeter to measure the voltage at both ends of lamp L1, as shown in the figure. When measuring the voltage at both ends of lamp L2, only connect the end of the voltmeter connected to A to C. This connection is incorrect (please fill in "Correct" or "Incorrect") because the positive and negative terminals of the voltmeter Connected backwards.

9. Xiaofu connected a new battery with a voltage of 4.5 V to the circuit as shown in the figure, and used a voltmeter to measure the voltage of the switch. When the switch is open, the voltage indication is approximately 4.5V; when the switch is closed, the voltage indication is approximately 0V.

10. When using a voltmeter to measure the voltage across the bulb L in the circuit as shown in the figure, the voltmeter should be connected at (A)

A. Between a and b, a is connected to the "+" terminal of the voltmeter.

B. Between a and b, b is connected to the "+" terminal of the voltmeter.

C. Between c and d, c is connected to the "+" terminal of the voltmeter.

D. Between c and d, d is connected to the "+" terminal of the voltmeter.

11. When Xiaoya was doing electrical experiments, she accidentally exchanged the positions of the voltmeter and ammeter. As shown in the figure, if the switch is closed at this time, then (D)

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, but the ammeter may be burned out.

12. (Yiyang High School Entrance Examination) In the circuit shown in the figure, what the voltmeter measures after the switch is closed is (B)

A.The voltage across L1 B.The voltage across L1 and L2

C.L3 and the voltage across the power supply D. The voltage across the power supply

13. As shown in the figure, both lights can light up after closing the switch, then (B)

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

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

C.A and B are both ammeters

D.A and B are both voltmeters

14. As shown in the figure, the power supply voltage remains constant and a is the wire connection from the negative terminal of the voltmeter. When a and b are connected, the voltage value is 6.0 V; disconnect a and b, and then connect them to c. After closing the switch S, the voltage value is 4.5 V. The following statement is correct: (C )

A. The power supply voltage is 4.5 V

B. When a and c are in contact, the voltmeter measures the voltage across L2

C. When a and c are in contact, the voltage across the bulb L1 is 4.5 V

D. When a and c are in contact, the voltage across the bulb L2 is 4.5 V

Voltage PPT, part 3: Expansion, exploration and breakthrough

16. In the experiment of "exploring the voltage of fruit batteries", the physics interest group:

Xiao Ming used copper and zinc sheets as electrodes and inserted smaller lemons into them to make a fruit battery, as shown in the picture. Xiaohua also made a fruit battery by inserting copper and aluminum sheets into larger lemons. They were connected to the same music chip, and Xiaohua's chip played louder than Xiaoming's chip. From this, they made the following conjecture:

Conjecture 1: The voltage of the fruit battery may be related to the size of the fruit;

Conjecture 2: The voltage of the fruit battery may be related to the material of the electrode.

(1) In order to verify the first conjecture, Xiao Ming used the same lemon to make a fruit battery, and slowly cut off the outer part of the lemon along the direction of electrode insertion, and measured the voltage respectively, as shown in Table 1:

(2) In order to verify the second conjecture, Xiaohua used a copper sheet as the positive electrode of the battery, and used zinc, aluminum, iron and other metal sheets with the same shape as the negative electrode of the battery. Insert the metal sheet electrode into the lemon, and maintain the distance between the electrodes and the insertion The depths are the same, and the voltages are measured respectively, as shown in Table 2:

Analyzing the data in the table, the conclusion is that the voltage of the fruit battery is related to the material of the electrode;

(3) Xiao Ming first pressed the lemon on the table and rolled it a few times, and then made it into a fruit battery. The measured voltage reached 1.0 V. Based on this, please ask a valuable and explorable question: The voltage of the fruit battery may be the same as that of the fruit. related to the softness and hardness.

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Update Time: 2024-10-19

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