The wattmeter is an instrument for measuring the electric active power in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.

What is wattmeter in English?

: an instrument for measuring electric power in watts.

What is the unit of wattmeter?

An instrument for measuring electric power in watts, the unit of electrical energy, volt times amperes; therefore, combining the functions of a volmeter and an ammeter. Abbrev., wm.