SOLVED - Horsepower to kilowatt-hours? 1. The problem statement, all variables and given/known data In the English system of units, power is expressed as horsepower (hp) instead of watts, where 1 hp=746 W. Horsepower is often used for motors and automobiles. How many kilowatt-hours of energy is produced when you run a 23.0 hp motor for 240 minutes? 2. Relevant equations 1 hp=746 W 1000 W=1 kW 60 min = 1 hr 60 s = 1 min 1 W = 1 J/s 3. The attempt at a solution I started by converting horsepower to Watts, then dividing by 1000 to get kilowatts. I then multipled by 3600 (60*60) to convert to kWs to kWh. I am then left with 4 hr (240 min) to factor in somewhere, but I don't know how to relate it to kWh with all the conversions happening. I tried multiplying by 4 but it said it was wrong.