The consumption of energy by a 60 watt bulb in 2 sec is_________________?
Correct answer: A. 120 J
- A. 120 J
- B. 60 J
- C. 30 J
- D. 0.02 J
Explanation
Power is the rate of energy consumption, so energy = power x time = 60 W x 2 s = 120 J. The likely wrong choice is b, 60 J, because it uses the power value without multiplying by the 2 s duration.
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About Power
Power is the rate at which work is done or energy is transferred, with average power calculated over a time interval and instantaneous power found from P = Fv when force and velocity are aligned. Work includes units, mechanical efficiency, and the distinction between power and total work or energy.
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