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How to use a seamless slide to identify voltmeter which voltage?

How to use the seamless slide to identify voltmeter which voltage? Below we have to learn more about the next.

Short circuit method:

Voltmeter removed, assuming the wire connected to the location, if at this time some of the appliances or power is shorted, then these appliances or power supply is the object of measurement of the voltmeter.

Source method:

"Remove" power (hand over the power), look at the voltage meter and which part of the closed loop, then the voltmeter is measured that part of the circuit voltage.

Slip line method:

Slide both ends of the voltmeter along the connected wires to either side of the appliance or power source. (Can cross the components: switch, ammeter. Can not cross the components: power supply, appliances, voltmeter.)

Description:

First, the measurement of the object: 1, with electrical appliances, power supply or a circuit;

Second, the method of judgment: 1, the source of law; 2, slide method; 3, short circuit method;

Third, special instructions: 1, voltmeter connected to the circuit is equivalent to the open circuit. 2, Ammeter connected to the circuit is equivalent to a wire. 3, the voltage meter and the electrical connection in series after the power supply at both ends of the voltmeter is the power supply voltage.

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