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220 V, 50 Hz, ac is applied to a resistor. The instantaneous value of voltage is

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220 V, 50 Hz, ac is applied to a resistor. The instantaneous value of voltage is 

(a) 220√2 sin 100π t 

(b) 220 sin 100π t 

(c) 220√2 sin 50π t 

(d) 220 sin 50π t

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1 Answer

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Best answer

 The correct option (a) 220√2 sin 100π t 

Explanation:

V = Vm sin ωt

Vm   = Vrms × √2 = 220 × √2 V

ω = 2πf = 2π × 50 = 100 π

∴ V   = 220√2 sin 100π t 

 

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