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    Working with Energy Conversion Efficiency

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    1. The instantaneous power waveform has frequency which is twice that of the source, This is because the E*I product gives a sine-squared function which is at twice the frequency of the original sine waves. But this is true only for a resistive circuit. So the answer is C.
    In other cases, the current will lag or lead the applied voltage and the power waveform will be a cosine wave with frequency at twice the source frequency.

    Instantaneous Power = E ...

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