Power & Energy Transfer
Physics: AQA GCSE Higher, topic 1.2.4
Power
Power (P) is the rate of energy transfer to a component. This is the same as saying power is the energy transferred per second. It is also equal to the rate at which work is done.
Power - energy transfer
- Power (watts, W) = energy transferred (joules, J) ÷ time (seconds, s)
Power - work done
- Power (watts, W) = work done (joules, J) ÷ time (seconds, s)
Test yourself on Power & Energy Transfer
When a current flows through a light bulb, it emits 30 J light energy in 2 seconds, what is the power of the bulb?