The rms value of voltage of an alternator is 200 V and the rms current delivered by it to a load is 3A. If the phase angle between the current and voltage is pi//6, find the power.

The rms value of voltage of an alternator is 200 V and the rms current

1.	The rms value of voltage of an alternator is 200 V and the rms current delivered by it to a load is 3A. If the phase angle between the current and voltage is pi//6, find the power.
Answer» Solution :The power in ac circuits is given by `P=E_("RMS")I_("rms") COS phi`. Here `E_("rms")=200V`, `I_("rms")=3Aand phi=pi//6=30^(@)` `therefore P=200xx3xx(SQRT3)/(2)=300sqrt3=519.6W`

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The rms value of voltage of an alternator is 200 V and the rms current delivered by it to a load is 3A. If the phase angle between the current and voltage is pi//6, find the power.

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