1 foot-pound = 3.766 E-7 kilowatt-hours = 3.24 E-4 Calories=3.77 E-4 watt-hour
= 1.28 E-3 Btu = 1.3558 Joule

1 Btu = 1054 Joules = 2.93 E-4 kilowatt-hour = 2.52 E-1 Calorie = 0.293 watt-hour
=778 foot-pounds = 1.05 E10 ergs

1 gram-calorie = 1.559 E-5 hp-hour = .001 Calorie = 1.163 E-3 watt-hour = 3.97 E-3 Btu

1 Joule = 2.78 E-7 kilowatt-hour = 2.39 E-4 Calorie = 2.79 E-4 watt-hour = 9.48 E-4 Btu

1 kilowatt-hour = 1 E3 watt-hour = 1.34 horsepower-hour = 3413 Btu = 2.655 E6 foot-pounds
= 3.60 E6 Joules = 8.60 E5 calories (gram-calories)

1 watt-hour = 1.34 E-3 horsepower-hour = 0.860 Calorie = 3.41 Btu

1 horsepower = 746 watts = 0.746 kw = 10.7 Calories/min = 550 ft-lbs/second

1 Calorie/second = 9.81 watts

1 kilowatt = 0.239 Calorie/sec = 1.34 hp = 4.43 E4 ft-lbs/min.

1 Btu/second = 1.41 horsepower = 1054 watts

1 lumen = 1.50 E-3 watt

1 watt of maximum visible radiation = 668 lumens