A size is compared to a unit of its kind.
Current:
Ampermeter
Voltage:
Voltmeter
Resistance:
Ohm-meter
Power:
Watt-meter
Frequency:
Frequency-meter
If the current,
voltage, resistance can be measured by the same measuring instrument, this
measuring instrument is called the aviator, and the measuring instrument with
other properties besides these three measurements is called the multimeter.
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