Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 892 · 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.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
4. 4.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 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?
11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
12. 12.True or false: to leave fridge door open saves electricity. (a) False (b) True
13. 13.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to leave the TV on standby saves electricity. (a) True (b) False
15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use LED lamps
16. 16.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
19. 19.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
20. 20.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
21. 21.True or false: to close the fridge quickly saves electricity. (a) True (b) False
22. 22.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to use LED lamps saves electricity. (a) False (b) True
25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) close the fridge quickly
28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
30. 30.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
32. 32.🧾 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?
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
34. 34.True or false: to use LED lamps wastes electricity. (a) False (b) True
35. 35.🧾 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?
36. 36.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use daylight to read (d) run fans in empty rooms
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
40. 40.True or false: to switch off empty rooms saves electricity. (a) True (b) False

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