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Question

Calculate the heat dissipated in the circuit in 30 seconds.

A
30 J
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B
45 J
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C
75 J
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D
125 J
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Solution

The correct option is C 75 J
The two resistors are in series. So, the equivalent resistance is:
Req=6 Ω+4Ω
Req=10 Ω

Power used is:
P=V2Req
P=5210=2.5 W

Energy consumed in 30 seconds is:
E=Pt
E=2.5×30=75 J

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