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Authoritative PPT Summary
"Voltage" Simple Circuit PPT Courseware 4
review memories
1. The basic circuit is composed of ( ) switches and wires, among which ( ) can maintain the current in the circuit.
2. The ammeter must be connected (in series) with the electrical appliance under test. The current must flow into the ammeter from the ( ) terminal and flow out from the ( ) terminal.
1. Voltage:
1. Voltage is a necessary condition for the formation of current. The function of the power supply is to provide voltage to both ends of the electrical appliance.
2. Symbol: U
3. Unit: volt (V), kilovolt (kV), millivolt (mV), 1 kV =103V 1 mV =10-3V
2. Voltmeter
1. Function:
2. Symbol: V
3.Terminal post
3. Voltmeter connection method
1. The voltmeter should be connected in parallel at both ends of the circuit under test;
2. Make the current flow in from the "+" terminal of the voltmeter and flow out from the "-" terminal;
3． The measured voltage cannot exceed the range of the voltmeter;
4. It is allowed to be directly connected to the two poles of the power supply. The measured value is the voltage of the power supply.
Voltmeter and ammeter (similar points)
1. Zero calibration is required before use.
2. When using, the current must flow in from the "+" terminal and out from the "-" terminal.
3. The measured current or voltage cannot exceed the range of the meter.
Voltmeter and ammeter (differences)
Serial number Ammeter A Voltmeter V
1 connected in series in the circuit connected in parallel at both ends of the circuit
2 Two ranges 0~0.6A Two ranges 0~3V
0～3A 0～15V
3 Cannot be directly connected to the power supply Can be directly connected to the power supply
4 Current unit---Ampere Voltage unit---Volt
Interactive exercise-1
1. Among the following statements about the electric meter as shown in the picture, which one is incorrect ( )
A. it's a voltmeter
B． It has one negative binding post and two positive binding posts
C. 0-15V range, each small division represents 0.5V
D． Its indication is 7.5V
Interactive Exercise-2
1. Which of the following statements is correct ( )
A. If there is voltage at both ends of the circuit, there must be current in the circuit.
B. There are a large number of free charges in the conductor. As long as a path is formed, there will be current in the conductor.
C. Voltage is a necessary condition for the formation of current in a circuit
D. If there is current in the circuit, there is not necessarily voltage.
Regarding the use of voltmeter, what is correct?
A. The voltmeter cannot directly measure the power supply voltage, otherwise it will burn out.
B. Choose as large a range as possible to avoid damaging the voltmeter.
C. After testing, if the measured voltage does not exceed the small range, the smaller range should be selected.
D. When the voltmeter is connected to the circuit, there is no need to consider the connection method of the "+" and "-" terminals.
Try your hand
6. In the circuit as shown in the figure, the correct connection method for meters a and b is ( )
A.a and b are both ammeters
B.a and b are both voltmeters
C.a is an ammeter, b is a voltmeter
D.a is a voltmeter, b is an ammeter
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