Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 717 · 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.True or false: to use LED lamps wastes electricity. (a) False (b) True
2. 2.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
4. 4.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
5. 5.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
7. 7.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) close the fridge quickly
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
10. 10.True or false: to unplug idle chargers saves electricity. (a) True (b) False
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
12. 12.🧾 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?
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
16. 16.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
17. 17.True or false: to use daylight to read wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
19. 19.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) set the AC to 24 °C (d) switch off empty rooms
20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
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 3 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 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?
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) set the AC to 24 °C (d) use old filament bulbs
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
26. 26.🧾 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
27. 27.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) use old filament bulbs
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
32. 32.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
33. 33.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.True or false: to leave fridge door open saves electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
37. 37.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
38. 38.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
40. 40.🧾 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?

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids