Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 724 · 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.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
3. 3.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
5. 5.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) run fans in empty rooms (d) close the fridge quickly
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
7. 7.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
9. 9.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.True or false: to use daylight to read saves electricity. (a) True (b) False
12. 12.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
13. 13.True or false: to switch off empty rooms saves electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
16. 16.True or false: to use LED lamps wastes electricity. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
18. 18.True or false: to use old filament bulbs saves electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
20. 20.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
22. 22.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
25. 25.True or false: to unplug idle chargers saves electricity. (a) True (b) False
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 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?
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
35. 35.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
36. 36.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
39. 39.True or false: to use LED lamps saves electricity. (a) True (b) False
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

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