Wattmeter
A wattmeter is an
instrument used to measure electric power consumed i.e energy absorved in unit
time by a circuit. The wattmeter consists of a movable coil arranged between a
pairof fixed coils in the form of a solenoid. A pointer is attached to the
movable coil. The free end of the pointer moves over a circular scale. When
current flows through the coils, the deflection of the pointer is directly
proportional to the power.
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