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Authoritative PPT Summary
"Voltage" Voltage and resistance PPT courseware
Review old stories and check with each other
1.SI unit of electric current
2. What are the measuring ranges of ammeters?
3. Correct use of ammeter
teaching objectives:
1. Have a preliminary understanding of voltage and its function. A power supply is a device that provides voltage. Know the units of voltage: volts (V), kilovolts (kV), millivolts (mV).
2. Know the voltage values of dry batteries, household circuits, etc.
3. Be able to connect the voltmeter and read the voltmeter.
1. Voltage
1. A power supply is a device that provides voltage, and voltage is the cause of current flow.
2. The unit is: volt, referred to as volt (V)
Commonly used units are kilovolts (kV) and millivolts (mV).
1 kV = 103 V
1 mV = 10-3 V
The voltage of a dry cell battery is 1.5V and the voltage of a household circuit is 220V.
The voltage of one battery is 2V, and the safe voltage for human body is not higher than 36V.
Voltmeter
1. Understand the voltmeter
The voltmeter is an important instrument for measuring voltage. Its component symbol is:
Voltmeters have two ranges:
Figure a shows that the ________ range is selected, and the graduation value is ________;
Figure b shows that the ________ range is selected, and the graduation value is ________;
How to use a voltmeter:
1. Calibrate the pointer of the voltmeter to zero.
2. The voltmeter should be connected in parallel with the electrical appliance under test in the circuit.
3. The current should flow in from the "+" terminal of the voltmeter and flow out from the "-" terminal.
4. The measured voltage cannot exceed the range of the voltmeter. (When the range cannot be estimated in advance, the "test touch method" should be used)
2. Voltage measurement - voltmeter
Experiment: Practice using a voltmeter
1. Measure the voltage of a dry battery and the voltage across the small light bulb.
2. Measure the voltage of two dry batteries connected in series and the voltage across the small light bulb.
Which of the following statements is correct ( )
A. If there is voltage at both ends of the circuit, there must be continuous 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 the cause of current in a circuit
D. If there is current in the circuit, there is not necessarily voltage.
Regarding the use of voltmeter, the correct one is ( )
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.
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