Question

If an A.C main supply is given to be $220V$ What would be the average e.m.f. during half cycle :-

• A. $198V$
• B. $386V$
• C. $256V$
• D. None of these

Answer 1

The correct option is A $198V$

It is given that the AC Voltage $=200V.$

It is required to calculate the average e.m.f during the positive half cycle.

Therefore, $V_{rms}=220\sqrt{2}V$

Average value of emf $=\frac{2V_{rms}}{\pi }$

$V_{avg}=\frac{2\times 200\sqrt{2}}{\pi }=198V$