"Measuring Voltage" Understanding Circuits PPT Courseware 2

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"Measuring Voltage" Understanding Circuits PPT Courseware 2

1. Voltage

1. The function of voltage: to produce ______ in the circuit. Voltage is represented by the letters ______.

2. The relationship between voltage and power supply: Voltage is provided by ______.

3. The unit of voltage is: ______, abbreviated as ______, and its symbol is “______”. Commonly used units include ______() and ______(), 1 kV=______V, 1 mV=______V. The voltage of a dry battery is generally ______, the voltage of domestic circuits in our country is ______, and the safety voltage for the human body is ______.

2. How to use a voltmeter

1. Voltmeter: The voltage is measured with ______, and its symbol in the circuit diagram is ______.

2. Range of voltmeter: Commonly used voltmeters have three binding posts and two ranges. When two terminals "-" and "3" are used, the measuring range is "______", each small grid represents ______, and each large grid represents ______; when two terminals "-" and "15" are used column, its measuring range is "______", each small grid represents ______, and each large grid represents ______.

3. How to read the voltmeter: first confirm the ______ of the voltmeter; then confirm the voltage values ​​represented by ______ and ______ on the scale according to the range; finally read _ according to the scale pointed after the pointer ______ _____.

4. Use the voltmeter correctly

(1) The voltmeter must be ______ with the electrical appliance being measured.

(2) It must be ensured that the current ______ from the positive terminal of the voltmeter and ______ from the negative terminal.

(3) Pay attention to choosing the appropriate ______.

How to use a voltmeter

To use a voltmeter correctly, you must have the "three skills", that is, the ability to "select", the ability to "connect", and the ability to "read".

(1) Be able to "select": select the appropriate range according to the actual situation of the circuit. If the range is selected too small, the measured voltage will exceed the range of the voltmeter, which will damage the voltmeter; if the range is selected too large, the reading accuracy will be low. If the magnitude of the voltage to be measured cannot be estimated in advance, you can select a larger range and perform a test touch.

(2) Be able to "connect": The voltmeter should be connected in parallel with the circuit under test, and the "-" terminal should be close to the negative pole of the power supply, and the "+" terminal should be close to the positive pole of the power supply.

(3) Be able to "read": first observe the terminal of the voltmeter connected to the circuit, confirm its range, then recognize the voltage value represented by each large grid and each small grid corresponding to this range, and read the voltage value indicated by the pointer .

Knowledge point 1 Voltage

1. Which of the following statements is correct ()

A. If there is voltage, there must be current.

B. If there is current, there must be voltage.

C. There must be current in a circuit with power supply

D. Current and voltage always exist at the same time

2. The voltage of electricity used in our daily life is ______. For the human body, only a voltage no higher than ______ is safe.

Knowledge point 2 Voltmeter and its usage

3. Which of the following statements is correct ()

A. The switch must be connected between the positive pole of the power supply and the electrical appliance to control the electrical appliance.

B. All power sources are devices that convert chemical energy into electrical energy.

C. Do not connect the voltmeter directly to both ends of the power supply

D. Do not connect the ammeter in parallel with the electrical appliance under test

4. In the circuit as shown in the figure, when the switch S is closed, the voltage measured by the voltmeter is ()

A. The voltage across the lamp L1

B. The voltage across the lamp L2

C. The voltage across the lamps L1 and L2

D.Power supply voltage

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Update Time: 2024-11-22

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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