Leslie Green asks:
Electrical energy can be measured in Joules, but for household use it is typically measured in kilowatt-hours (kWh). If a 100 Watt bulb is switched on for 8 hours every day for a year, roughly how much energy is consumed?
J = 1000 x kW x S
where J = Joules, kW = kilowatts, and S = seconds
800 Joules300 kWh1 kW3 MJoules