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Q.

A current i=(2+3 cos 100πt+ 4 sin 100πt) A is flowing through a 10Ω resister. If the potential difference across the resister is measured by an A.C voltmeter, then reading of the voltmeter (Approximately is)

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a

20 V

b

40 V

c

16 V

d

30 V

answer is B.

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Detailed Solution

Irms =22+32+422A=16.5 A≃4A ∴ Reading of voltmeter =Irms ×R=4×10 V≃40V.

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A current i=(2+3 cos 100πt+ 4 sin 100πt) A is flowing through a 10Ω resister. If the potential difference across the resister is measured by an A.C voltmeter, then reading of the voltmeter (Approximately is)