Define average value.
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The value obtained by averaging all the instantaneous value over a period of half cycle is called as average value.

Average value for current = 0.637 × Im

Average value for voltage = 0.637 × Vm

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Average Value of Sinusoidal AC Waveform: The average value is defined as the arithmetical average or mean value of all the values of an alternating quantity over one cycle. 

And/OR 

For an alternating current , the average value is defined as that value of steady current (DC) which transfers the same charge as is transferred by the alternating current during the same time under the same conditions. 

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