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If an A.C. mains supply is given to be 220 V, what would be the average e.m.f.

If an A.C. mains supply is given to be 220 V, what would be the average e.m.f. during a positive half cycle?

Options

(a) 256 V
(b) 512 V
(c) 386 V
(d) 198 V

Correct Answer:

198 V

Explanation:

Vₐᵥ = 2V₀ / π = (2 / π) [V(rms) × √2] = (2√2 / π) × V(rms)

Vₐᵥ = (2√2 / π) × 220 = 198 V

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