UPSC 2016 CDS I GK Paper

The SI unit of mechanical power is Watt. The watt unit is named after James Watt, the inventor of the steam engine. One watt is defined as the energy consumption rate of one joule per second.
1W = 1J/1s
In Physics, power is the rate of doing work, the amount of energy transferred per unit time. Having no direction, it is a scalar quantity.