Wattmeter

Wattmeter has two coils in it-the current coil & pressure coil, why is the pressure coil so named? How is the power being measured by the Wattmeter?

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mallick.subratkumar
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Mar 21st, 2009

Current coil means it measure current of circuit & pressure coil means it measure voltage, when current coil is connected series, pressure coil connected parallel in one circuit ,as P=V*I*cosØ,
So we have V, I, & Ø=[1/tan(V/I)],
Now the power is being measured.