Your hydro bill never mentions joules — the joule is too small a coin for a month of electricity. The bill's unit is the kilowatt-hour (kWh): what a 1000 W device spends in one hour of running. Energy is power times time — $E = P\,t$, read aloud: E equals P t — and if the power wears kilowatts and the time wears hours, $E$ lands in kilowatt-hours, exactly the coin the meter counts.

So every bill is a two-step: watts to kilowatts first (÷1000 — kilo means a thousand), THEN multiply by the hours, then by the rate in cents per kilowatt-hour. In Ontario that rate hovers around ten to fourteen cents. Skip the ÷1000 and your kettle appears to cost more than the house — the meter would like a word.