Three phase power is a three wire ac power circuit with each phase ac signal electrical degrees apar residential homes are usually served by a single phase power supply while commercial and industrial facilities usually use a three-phase supply.
what is ampmeter
An ammeter measures the electric current in a circuit. the name is derived from the name for the sl unit for electric current amperes A, in order for an ammeter to measure a device's current it must be connected in series to that device.
what is voltmeter
A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. an ammeter is a measuring device used to measure the electric current in a circuit.

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