Q.

What is the r.m.s. value of an alternating current which when passed through a resistor produces heat which is thrice of that produced by a direct current of 2 amperes in the same resistor

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a

6 amp

b

2 amp

c

3.46 amp

d

0.66 amp

answer is C.

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Detailed Solution

Heat produced by ac = 3 x Heat produced by dc
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What is the r.m.s. value of an alternating current which when passed through a resistor produces heat which is thrice of that produced by a direct current of 2 amperes in the same resistor