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Question

Two bulbs with individual power ratings 1 W at 12 V and 2 W at 12 V are connected in parallel with a 12 V battery as shown. How much heat will be dissipated by respective bulbs in 10 seconds?


A
1 J, 2 J
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B
2 J, 1 J
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C
10 J, 20 J
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D
20 J, 10 J
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Solution

The correct option is C 10 J, 20 J
As the two bulbs are connected in parallel, the volatge across both the bulbs will be same and is 12 V in this case.

Heat dissipated by bulbs:
H=VIt
=Pt

Heat dissipated by 1 W bulb is:
H1=1×10=10 J
Heat dissipated by 1 W bulb is:
H2=2×10=20 J

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