Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 121 · 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) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
3. 3.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
4. 4.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
5. 5.🧾 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?
6. 6.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) close the fridge quickly (d) unplug idle chargers
9. 9.True or false: to use LED lamps wastes electricity. (a) False (b) True
10. 10.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.True or false: to close the fridge quickly saves electricity. (a) True (b) False
13. 13.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
15. 15.True or false: to switch off empty rooms saves electricity. (a) True (b) False
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
17. 17.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
19. 19.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
20. 20.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
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 7 hours. How many watt-hours (Wh) are saved?
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
26. 26.True or false: to use old filament bulbs saves electricity. (a) True (b) False
27. 27.True or false: to leave the TV on standby saves electricity. (a) False (b) True
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 5 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.🧾 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?
31. 31.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.True or false: to leave fridge door open wastes electricity. (a) False (b) True
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C

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