Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 740 · 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 use daylight to read? (a) wastes electricity (b) saves electricity
2. 2.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) set the AC to 24 °C
4. 4.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
5. 5.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) use old filament bulbs
11. 11.True or false: to leave fridge door open wastes electricity. (a) False (b) True
12. 12.True or false: to use LED lamps saves electricity. (a) False (b) True
13. 13.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open
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 9 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
19. 19.True or false: to leave the TV on standby saves electricity. (a) False (b) True
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
24. 24.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.True or false: to use daylight to read saves electricity. (a) False (b) True
27. 27.True or false: to close the fridge quickly saves electricity. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
30. 30.True or false: to switch off empty rooms saves electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
33. 33.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
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.💡 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 9 hours. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
38. 38.True or false: to use LED lamps wastes electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
40. 40.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) close the fridge quickly

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