Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 547 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
5. 5.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read
8. 8.True or false: to use LED lamps saves electricity. (a) True (b) False
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) unplug idle chargers (d) set the AC to 24 °C
11. 11.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
12. 12.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to leave the TV on standby saves electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
16. 16.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
18. 18.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
19. 19.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.True or false: to use old filament bulbs saves electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
26. 26.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
28. 28.True or false: to use daylight to read saves electricity. (a) False (b) True
29. 29.True or false: to leave fridge door open wastes electricity. (a) False (b) True
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 6 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to use LED lamps wastes electricity. (a) True (b) False
32. 32.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
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.True or false: to unplug idle chargers saves electricity. (a) False (b) True
36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) leave the TV on standby (d) set the AC to 24 °C
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) iron one shirt at a time
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms

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