Definition §

Power

Power is a measure of Energy Transferred or Work Done per unit of time. It is used to

The formula can be used for any type of power (double check for mechanical power).

P = Power (Watt) E = Energy Transfer (Joule) t = Time in Seconds

Electrical Power §

Electrical Power

Power, in the context of Electricity, is measured in Watts, and tells us how many Joules are transferred per second, Higher power, more energy is being used per-second.

you can also sub in voltage formula Where: P = Electrical Power V = Voltage I = Current

Mechanical Power §

Mechanical Power

Mechanical Power, measured in Watts, measures

Example - If a bulb uses 60kJ of energy in 10 minutes, what is the power rating of the bulb?

= = = Watt

Practise

A winch lifts a 500 kg pallet of bricks to a height of 10 m in a time of 15 seconds. Calculate the minimum output power of the lift.