When work is done on an object, energy is transferred. The Per unit time or ‘per second’. For example, if 2,000 J are transferred over a period of 10 s, then the rate of transfer is 200 J/s or 200 W. This value is the power rating. at which this energy is transferred is called The energy transferred each second, measured in watts (W). Power = work done ÷ time taken.. So the more powerful a device is, the more energy it will transfer each second.
