The power output of a lamp is 6W. How much energy does the lamp give out in 2 minutes?
Correct answer: C. 720 J
- A. 3 J
- B. 120 J
- C. 720 J
- D. 430 J
Explanation
To find the energy (E) given out by the lamp, we use the formula:E = P twhere P is power and t is time.Given:P = 6 Wt = 2 minutes = 2×60 = 120 secondsCalculation:E = 6×120 = 720 JThe lamp gives out 720 Joules of energy.
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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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