Question: how many joules of energy are used by a 2.0 hp motor that runs for 1.0 hr?
Answer: It is an easy calculation. 1 hp is 746 W, which is the same as 746 J/s. So in one hour you have 3600 seconds. So it will be 746 J/s times 3600 s, which will give you : 2,685,600 Joules !!