Lessons 25

Q 1: Choose the wrong answer: Voltmeter is a tool to measure

• A. potential difference between two power supply terminals.

• B. potential difference between the two ends of the bulb.

• C. potential difference between two points of a circuit.

• D. the potential difference of the anode of the power source or of any other point on the circuit.

Q 2: Choose the correct answer: Measure the potential difference between the two terminals of the power source when the circuit is open.

• A. Connect the voltmeter in parallel with the two poles of the power source. The positive pole of the voltmeter connects to the positive pole, the negative pole connects to the negative pole of the power supply

• B. Connect the voltmeter in parallel with the two poles of the power source. The positive terminal of the voltmeter connects to the negative terminal, the negative terminal connects to the positive terminal of the power supply.

• C. Connect the voltmeter in series with the two poles of the power supply. The positive terminal of the voltmeter connects to the positive terminal, the negative terminal connects to the negative terminal of the power supply.

• D. Connect the voltmeter in series with the two poles of the power supply. The positive terminal of the voltmeter connects to the negative terminal, the negative terminal connects to the positive terminal of the power supply.

Q 3: Use a voltmeter with the smallest division of 0.2 V to measure the potential difference between the two terminals of the power source when it is not connected to the circuit. Which of the following is the correct way to write measurement results?

• A. 314 mV

• B. 5,8 V

• C. 1,52 V

• D. 3,16 V

Q 4: The voltmeter in the diagram below is correct?

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Q 5: Which of the following statements is incorrect?

The unit of voltage is:

• A. Vôn (V)

• B. Ampe (A)

• C. Milivôn (mV)

• D. Kilovôn (kV)

Q 6: Factors that are not necessary to check when using a voltmeter to measure voltage are:

• A. Dimensions of the voltmeter

• B. Measuring limit and minimum division of voltmeter

• C. How to connect a voltmeter in the circuit.

• D. The needle points at the zero line of the voltmeter.

Q 7: Fill in the blanks with suitable words

The power source generates between its two poles a…………………….

• A. Electric potential

• B. Voltage

• C. Electric potential

• D. Amperage

Q 8: Between two holes of an electrical outlet taken in a home electrical network in Vietnam, the value of voltage is:

• A. 100 V or 200 V

• B. 110 V or 220 V

• C. 200 V or 240 V

• D. 90 V or 240 V

Q 9: To measure the potential difference between the two ends of an electrical outlet in the house, we must adjust it on a voltmeter with a measurement limit:

• A. Direct current (DC), GHG is 220 V

• B. Alternating current (AC), GHD less than 220 V

• C. Direct current (DC), GHD greater than 220 V

• D. Alternating current (AC), GHD greater than 220 V

Q 10: Choose the wrong sentence

• A. 1V = 1000mV

• B. 1kV = 1000mV

• C. 1mV = 0,001V

• D. 1000V = 1kV