The DC content in inductor current is decided by two factors – the initial condition and
the instant of application of the alternating voltage. Examine the integral of voltage waveform
in Fig. 3.2-3. The voltage waveform was applied to the inductor at its zero-crossing. Therefore,
its integral goes to a maximum value of 1 volt-sec in the first half-cycle and then returns to
zero at the end of second half-cycle. It does not go negative. This area waveform divided by
Lwill give us the current in the inductor with zero initial condition. Notice that the current will
have a DC content since the voltage area waveform has a DC content. Thus, the net DC ...
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