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.
Last updated
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.
Practise Work and Energy
748 free Work and Energy MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.