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Tuesday, 18 December 2012

Wattmeter


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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