Question

If an ac main supply is given to be 220 V. What would be the average e.m.f. during a positive half cycle

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

Answer 1

The correct option is A 198V

$V_{av}=\frac{2}{\pi }{V}_0=\frac{2}{\pi }\times (V_{rms}\times \sqrt{2})=\frac{2\sqrt{2}}{\pi }.V_{rms}$
$=\frac{2\sqrt{2}}{\pi }\times 220=198V$