Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 699 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
2. 2.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
7. 7.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
14. 14.True or false: to switch off empty rooms saves electricity. (a) True (b) False
15. 15.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
17. 17.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
23. 23.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use daylight to read (d) unplug idle chargers
27. 27.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
29. 29.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.True or false: to use daylight to read wastes electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
33. 33.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) use daylight to read
34. 34.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
38. 38.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to use old filament bulbs saves electricity. (a) False (b) True

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