Electricity units and saving power — Electronics for kids
The electricity bill counts energy in units: 1 unit = 1 kilowatt-hour (kWh) = 1000 watts used for 1 hour. A 100 W appliance running for 5 hours uses 100 × 5 = 500 Wh = 0.5 unit. The bill is units × the price of one unit. We save electricity by switching off empty rooms, using LED lamps instead of filament bulbs, using daylight and unplugging idle chargers.
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
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🏁 Lesson 19 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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