Electricity Bill

Class 10 Science: electricity (electric power and energy)

Choose how long each appliance runs and see how many units (kWh) your home uses and what the bill comes to.

Words to know

Power: How fast an appliance uses energy, in watts (W) or kilowatts (kW).
Energy: Power × time; the bill counts it in kilowatt-hours (kWh).
Unit: One kilowatt-hour: 1000 W used for 1 hour.
Commercial unit: Another name for the kWh on an electricity bill.

Quick check

Answer 3 questions to check what you learned.

1. A 100 W TV runs for 10 hours. How many units (kWh) does it use?

2. One unit on an electricity bill means…

3. Which appliance uses the most energy in one hour?

Try at home

Find your family's electricity bill. How many units did you use last month, and what is the price per unit? Which appliance do you think used the most?

Next, try a full lab

RC Circuit Battery Storage All Class 9–10 labs