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Can the instantaneous power output of an AC source ever be negative ? Can average power output be negative ? Justify your answer. |
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Answer» Solution :YES, Instantaneous POWER output of an AC source can be negative. Instantaneous power output `P= EI = (E.I.)/( 2)[cos phi - cos (2 omega t + phi)]` No, `P_("avc") = V_("rms") I_("rms") cos f` `P_("avc" gt 0)` `cos phi = (R )/(Z ) gt 0` |
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