Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 358 · 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 iron one shirt at a time? (a) saves electricity (b) wastes electricity
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) run fans in empty rooms
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.True or false: to use daylight to read saves electricity. (a) False (b) True
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
7. 7.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
14. 14.True or false: to leave the TV on standby saves electricity. (a) False (b) True
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) use daylight to read (d) switch off empty rooms
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
17. 17.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
18. 18.True or false: to use old filament bulbs saves electricity. (a) False (b) True
19. 19.🧾 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?
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🧾 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?
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) close the fridge quickly (d) iron one shirt at a time
31. 31.True or false: to use LED lamps saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
33. 33.True or false: to use daylight to read wastes electricity. (a) False (b) True
34. 34.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.True or false: to use LED lamps wastes electricity. (a) True (b) False
36. 36.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to switch off empty rooms saves electricity. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
40. 40.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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