Power is the rate at which work is done.Power = energy transferred ÷ the time for the energy transfer.Power is measured in watts. One watt is the power of an object that does work at a rate of 1 joule per second.If an object of mass 1kg is raised upwards by a crane at a speed of 3ms-1 the change in gravitational potential energy mgΔh per second i.e. the power is:Power = 1 × 9.81 × 3 = 29.43watts.
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Specification: Edexcel Physics (8PH0), AS-level, Topic 2: Mechanics, statements 28 and 29. Topic: Energy.
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- Gravitational Potential Energy
- Kinetic Energy
- Conversion Between Gravitational and Kinetic Energy
- Work
- Efficiency
All 6 lessons in Energy · All Edexcel AS-level Physics topics