Why is my kettle a small line on the bill when it draws so many watts?

Because watts are a rate, not an amount. A 2000-watt kettle boiling 10 minutes a day uses about 10 kWh a month, which at the example tariff of 0.15 costs about 1.5.

Do I need special equipment to check my consumption?

No. The meter records cumulative kilowatt-hours; take two readings, subtract, multiply by the tariff. That is the entire procedure.

Is standby really worth worrying about?

Per device, no: a device on standby typically draws 1 to 10 watts. In aggregate, yes — a household can run a dozen of them around the clock, which is a continuous base load.

Where should I cut first?

Start with the largest loads. In most homes the largest electrical loads are heating, cooling and water heating, ahead of lighting and electronics.

How much electricity do my appliances use?

Breeze Electric — Home Electricity Costs | breezerelectric.com

Breeze Electric is an independent reference on household electricity: watts, kilowatt-hours, the meter and the bill. A kilowatt-hour is one kilowatt sustained for one hour — exactly 3.6 megajoules — and your meter counts kilowatt-hours cumulatively while the bill multiplies the difference between two readings by the tariff. This reference lists what appliances draw (an electric kettle about 2000-3000 watts, an LED bulb 9-12 watts where the incandescent it replaced needed 60), shows the meter-reading arithmetic, and walks the ordered steps that find and cut the standby base load.

Rates and amounts

Watts measure a rate; kilowatt-hours measure an amount. One kWh is the energy of one kilowatt running for one hour, exactly 3.6 megajoules. Every calculation on this site moves between the two.

The meter and the bill

The meter records cumulative kilowatt-hours. The bill is the difference between two readings multiplied by the tariff — three operations, no more, and the worked example at 0.15 per kWh shows each one.

Where to cut

Heating, cooling and water heating are the largest loads in most homes, ahead of lighting and electronics. Standby adds 1 to 10 watts per device around the clock, and a household can run a dozen of them.

The meter records cumulative kilowatt-hours; the bill is the difference between two readings multiplied by the tariff.

What is a kilowatt-hour, really?

A kilowatt-hour is the energy of one kilowatt running for one hour, exactly 3.6 megajoules.

Wattage is a rate — how fast energy is being drawn right now. A kilowatt-hour is an amount — what you get when that rate is sustained for an hour. Your bill counts amounts, not rates, which is why a 2000-watt kettle running 10 minutes a day is a small line item while a 150-watt heater running 24 hours is a large one.

The conversion is fixed by definition: 1 kWh = 3.6 MJ. Nothing about your appliances changes it. What changes is how many hours each device sits at how many watts, and that is the whole arithmetic of a household bill.

The watt itself carries history: it is named after James Watt, the Scottish engineer. For scale, one horsepower is about 746 watts — a figure worth knowing when you compare electric motors to engine ratings.

Rate, in watts: what a device draws while it is running.
Amount, in kilowatt-hours: rate × hours ÷ 1000.
Cost: amount × tariff, tariff being the price of one kWh.

Figures and worked examples

Each figure carries its own caption and stands on its own arithmetic.

The key terms of this guide, drawn to one scale

Appliances, draws and costs

Twelve common appliances: draw, energy per hour of use, and monthly cost at an illustrative tariff of 0.15 per kWh, assuming one hour of use per day.
Appliance	Draw (watts)	kWh per hour of use	Monthly cost at 0.15/kWh
Electric kettle (boiling)	2000–3000	2.0–3.0	9.00–13.50
Modern refrigerator (daily average)	100–200	0.10–0.20	0.45–0.90
LED bulb	9–12	0.009–0.012	0.04–0.05
Incandescent bulb (replaced by LED)	60	0.06	0.27
Device on standby (low end)	1	0.001	0.005
Device on standby (high end)	10	0.01	0.045
Dozen standby devices, 24 h/day	12–120	0.12–1.20	0.54–5.40
Kettle, 10 min/day (worked example)	2000	0.33 per session	about 1.50 per month

Twelve common appliances: draw, energy per hour of use, and monthly cost at an illustrative tariff of 0.15 per kWh, assuming one hour of use per day.

Common questions

Why is my kettle a small line on the bill when it draws so many watts?: Because watts are a rate, not an amount. A 2000-watt kettle boiling 10 minutes a day uses about 10 kWh a month, which at the example tariff of 0.15 costs about 1.5.
Do I need special equipment to check my consumption?: No. The meter records cumulative kilowatt-hours; take two readings, subtract, multiply by the tariff. That is the entire procedure.
Is standby really worth worrying about?: Per device, no: a device on standby typically draws 1 to 10 watts. In aggregate, yes — a household can run a dozen of them around the clock, which is a continuous base load.
Where should I cut first?: Start with the largest loads. In most homes the largest electrical loads are heating, cooling and water heating, ahead of lighting and electronics.