Question

What is the average or mean value of an alternating emf? Obtain the expression for it.
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Answer 1

Answer. The average value of AC over a half cycle is that value of steady current that would send same amount of charge in same interval of time that would be sent by the DC in same time. Therefore the average ac over a complete cycle is zero.

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Answer 2

Answer:

i. average or mean value of A.C. is the average of all values of the voltage (or current) over the one-half cycle.

ii. Since the average value of sin wt over a cycle is zero, the average value over a full cycle is always zero.

iii. Hence, the mean value of AC over a cycle has no significance and the mean value of AC is defined as the average over half cycle.

iv. The average value of sine in the range 0C to π is given as,

(sin 8)

=0.637

Therefore, average value of emf = 0.637 x peak value i.e., eav = 0.637 eo