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"Voltage" Voltage resistance PPT download
Part One: Learning Objectives
1. Know the role of voltage and that a power supply is a device that provides voltage; know the unit of voltage and its conversion, and remember the voltage values of dry batteries and household circuits.
2. Understand the voltmeter, understand its purpose and symbols; be able to use the voltmeter correctly to measure voltage.
Voltage PPT, part 2 content: 1. Voltage
Observe and think
1.The meaning of voltage
For there to be current in a circuit, there must be voltage across it.
The function of the power supply is to provide voltage to both ends of the electrical appliance.
2. Unit of voltage:
International unit: volt (volt), referred to as volt (V).
Commonly used units: kilovolts (kV); millivolts (mV).
Conversion: 1 kV =1000 V
1 V =103 mV
Voltage PPT, part three: 2. Measurement of voltage
Observe and think
How to measure the voltage?
A tool for measuring voltage is called a voltmeter. Its symbol in the circuit is V.
Observe the voltmeter
When measuring the voltage across a component with a DC voltmeter, it should be connected in parallel with the component. The terminal marked with a "-" should be near the negative terminal of the power supply and the other terminal near the positive terminal of the power supply. The maximum measured value of the range used must be greater than the voltage across the circuit under test.
When the approximate value of the measured voltage is not known in advance, if it is determined that the measured voltage will not exceed 15V, you can first use the range with the maximum measurement value of 15V; if the measured voltage does not exceed 3V, in order to improve the accuracy of the reading, You can instead use the range with a maximum measurement value of 3V for measurement.
Voltage PPT, Part 4: Experiment and Investigation
Practice using a voltmeter
1. Connection of voltmeter
2. Reading of voltmeter
The first step: look at the measuring range;
Step 2: Look at the minimum graduation value;
Step 3: Reading.
3. Measure the voltage with a voltmeter
Connect the voltmeter to both ends of the small light bulb, turn on the circuit, and the data read is ＿＿＿＿V;
Connect the voltmeter to both ends of the power supply, turn on the circuit, and the data read is __________V.
Voltage PPT, Part 5: In-class training
1. The symbol for voltage is ____, the international unit is ____, and it is represented by the letter ____.
2. (1) The safe voltage for the human body is ____ volts
(2) The voltage of a dry cell is ____ volts = ____ millivolts
(3) The voltage of household circuits in my country is ____ volts = ____ kilovolts
3. As shown in the figure, to use a voltmeter to measure the voltage at both ends of lamp L2, the correct circuit diagram is ( )
4. In the circuit shown in the picture, after the switch is closed, the consequences will be ( )
A. The ammeter and voltmeter were burned out
B. Neither the ammeter nor the voltmeter will be burned out.
C. Only the voltmeter will be burned out
D. Only the ammeter will be burned out
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"Voltage" Voltage Resistance PPT Part One Content: Knowledge Points Basic Knowledge Point 1 Voltage 1. The units of voltage include volts (V), kilovolts (kV), and millivolts (mV). The conversion relationship between them is 1 kV= 103 V = 106 mV. 2. Which of the following statements is correct (A..
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