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A voltage v (t) = 100sinωt is applied to a circuit. The current flowing through the circuit is i(t) = 15sin(ωt-30⁰). Find the effective value of voltage.

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A voltage v (t) = 100sinωt is applied to a circuit. The current flowing through the circuit is i(t) = 15sin(ωt-30⁰). Find the effective value of voltage.

(a) 70

(b) 71

(c) 72

(d) 73

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Right choice is (b) 71

Easiest explanation: The expression of effective value of voltage is Veff = Vm/√2. Given  Vm = 100. On substituting the value in the equation we get effective value of voltage = 100/√2 = 71V.

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