Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 446 · 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.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
3. 3.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
4. 4.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
5. 5.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
10. 10.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
14. 14.True or false: to leave the TV on standby saves electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 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?
18. 18.🔍 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
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) iron one shirt at a time
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) use old filament bulbs
23. 23.True or false: to use LED lamps wastes electricity. (a) True (b) False
24. 24.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
27. 27.True or false: to leave fridge door open saves electricity. (a) True (b) False
28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
32. 32.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
33. 33.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
37. 37.True or false: to use old filament bulbs saves electricity. (a) False (b) True
38. 38.True or false: to switch off empty rooms saves electricity. (a) False (b) True
39. 39.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
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 5 hours. How many watt-hours (Wh) are saved?

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