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Question

If the power rating of a tubelight is 40 watts, calculate the rate at which the tubelight is consuming electricity in Joules per second (J/s).

A
80 J/s
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B
40 J/s
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C
220 J/s
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D
40×103 J/s
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Solution

The correct option is B 40 J/s
Given:
Power rating of tubelight = 40 watts
Since 1 Joule per second = 1 watt
Rate of consumption of electricity in J/s = 40×1 = 40 J/s.
Therefore the 40 watts tubelight is consuming electricity at the rate of 40 Joules per second.

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