Question

The instantaneous voltage through a device of impedance
20 ???? is e = 80 sin 100 πt. The effective value of the current is
(a) 3 A (b) 2.828 A (c) 1.732 A (d) 4 A

Answer 1

The correct option (b) 2.828 A

Explanation:

E = 80 sin 100πt

here Em = 80V

∴ Erms = (80 / √2) V

∴ effective value of current = Irms = [Erms / z]

∴ Irms = [{80 / √2} / {20}]

= (4 / √2)= [{4√2}/ {2}]

= 2√2

Irms = 2 × 1.414

Irms = 2.828 A.

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