text: power rating of electric motor? if 110 bricks each with a mass of 2.5kg are raised vertically 10 metres in 10 seconds, what is the power rating in watts, of the electric motor. assume there is no friction or effects from the gearbox. the power rating would be described as the work done upon the time takes.  the work done= number of bricks*mass of each*accln due to gravity* height=2750 joules (assuming accln due to gravity to be 10) time taken =10 seconds power is hence: 275 w or 0.275 kw