The consumption of energy by a 60-watt bulb in 2 seconds is
Correct answer: A. 120 J
- A. 120 J
- B. 30 J
- C. 60 J
- D. 10 J
Explanation
Power (P) is defined as the rate at which work is done or energy is consumed. It is given by the formula P=W/t , where W is the work done or energy consumed and t is the time taken. Rearranging the formula, we get W=P×t. Substituting the given values, P=60W andt=2s, we get W=60×2=120J.Incorrect Options Explanation:(b) 30 J: This value is too low and does not correspond to the given power and time.(c) 60 J: This value is incorrect as it does not correspond to the given power and time.(d) 10 J: This value is too low and does not correspond to the given power and time.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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