Power and Work Done | GCSE Physics Questions
Power is the rate at which energy is transferred or the rate at which work is done.
What is the unit for power?
What is Power and Work Done | Questions?
"The rate at which work is done or energy is transferred."
Which law states that energy cannot be created or destroyed?
Why can efficiency never be 100% in a mechanical system?
A 5 kg weight is lifted 2 metres. Calculate its GPE (g = 9.8).
Which formula is used to calculate kinetic energy?
Work and Time
Power is measured in Watts (W).
1 Watt = 1 Joule per second (1 J/s).
Power = Energy / Time (P = E/t) or Power = Work Done / Time (P = W/t).
A powerful machine transfers a lot of energy in a short time.
Common Trap: Students confuse Power with Force or Energy. Power is always about the TIME taken to transfer that energy.
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