Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 633 · 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 is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
3. 3.True or false: to switch off empty rooms saves electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
5. 5.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
7. 7.True or false: to use LED lamps saves electricity. (a) False (b) True
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
10. 10.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) use daylight to read
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
15. 15.🧾 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?
16. 16.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
17. 17.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
18. 18.🧾 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?
19. 19.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
21. 21.True or false: to unplug idle chargers saves electricity. (a) True (b) False
22. 22.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
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 3 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 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?
29. 29.🧾 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?
30. 30.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
31. 31.🧾 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?
32. 32.🧾 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
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
34. 34.True or false: to use LED lamps wastes electricity. (a) True (b) False
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
37. 37.True or false: to use old filament bulbs saves electricity. (a) True (b) False
38. 38.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
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) switch off empty rooms
40. 40.True or false: to use daylight to read saves electricity. (a) False (b) True

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