Moderate
Energy consumed by 60 watt bulb in 2 minutes is equal to:
Correct answer: A. 7.2 kilo joules
- A. 7.2 kilo joules
- B. 720 joules
- C. 120 joules
- D. 72000 joules
Explanation
Power=Energy/time Energy=power ×time 60 watt×120 sec =7200 J =7.2 kilo J.
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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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