This is a guide primarily aimed at analogue panel meters, volts and amps. Typically these meters do not need an external source of power to enable the meter to function. These meters draw a tiny amount of power from the circuit they are in.
Digital multimeters operate in a similar way, but they are usually powered by an internal battery. When using a digital multimeter to measure voltage or current, always check the test leads are in the correct sockets on the meter before connecting them to the circuit. Connecting a meter configured in ammeter mode directly across a voltage source will cause a near short circuit, possibly causing damage and blowing a fuse in your meter.
VOLTMETERS Symbol Connection Diagram
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