Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 735 · 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 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?
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
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 9 hours. How many watt-hours (Wh) are saved?
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
6. 6.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
8. 8.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
10. 10.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
13. 13.True or false: to use LED lamps saves electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
16. 16.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) switch off empty rooms (d) unplug idle chargers
17. 17.True or false: to use LED lamps wastes electricity. (a) False (b) True
18. 18.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to close the fridge quickly saves electricity. (a) True (b) False
24. 24.🧾 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?
25. 25.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
27. 27.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 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?
29. 29.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
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 2 hours. How many watt-hours (Wh) are saved?
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
33. 33.True or false: to use daylight to read saves electricity. (a) False (b) True
34. 34.🧾 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?
35. 35.🧾 A 40 W filament bulb is swapped for a 6 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 switch off empty rooms saves electricity. (a) False (b) True
37. 37.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) switch off empty rooms
38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 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?

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