The consumption of energy by a 60 W bulb in 2 s is:
Correct answer: A. 120 J
- A. 120 J
- B. 60 J
- C. 30 J
- D. 0.02 J
Explanation
Given:Power = P = 60 wattTime = t = 2 secondsEnergy = E = ?To determine the consumption of energy, we can use theformula:E = P × tE = 60 × 2E = 120 Joules
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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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