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Q.

The rms value of an alternating current, which when passed through a resistor produces heat three times of that produced by a direct current of 2A in the same resistor, is

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a

6A

b

2A

c

3A

d

$2 \sqrt{3} A$

answer is D.

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Detailed Solution

$H_{ac} = 3 H_{DC}; i_{dc} = 2 A; i_{rms}^{2} Rt = 3 i_{DC}^{2} Rt$

$i_{rms} = 2 \sqrt{3}$

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