#voltmeter

Voltmeter Voltage is measured by an instrument called voltmeter. A voltmeter as shown in has two terminals. Red port is its positive terminal while black port is its negative terminals. It has pointer

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There are times when it is necessary to measure high voltage. For example, 10kV, 20kV and so on. You can certainly buy a high voltage voltmeter, but as far as I understand such devices are very expensive.