A bulb marked 12 V, 24 W operates 12 volt battery for 20 minutes. The energy consumed is:
A
28800J
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B
360000J
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C
25660J
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D
144000J
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Solution
The correct option is A28800J Energy (power×time) is measured in Joules and by including time (t) in the power formulae, the energy dissipated by a component or circuit can be calculated.
Energy dissipated Q= Pt.
In the question, the time taken is given as 20 minutes, that is 20×60=1200seconds and the power is 24 W.
Hence, the energy consumed by the bulb is 24W×1200s=28,800Joules.