Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 114 · 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 daylight to read saves electricity. (a) False (b) True
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
4. 4.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) set the AC to 24 °C
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
7. 7.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
8. 8.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
9. 9.🧾 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?
10. 10.True or false: to leave fridge door open saves electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.True or false: to leave the TV on standby saves electricity. (a) True (b) False
13. 13.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
15. 15.True or false: to use LED lamps wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.True or false: to use daylight to read wastes electricity. (a) False (b) True
18. 18.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
21. 21.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
22. 22.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
24. 24.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
26. 26.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
27. 27.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
31. 31.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) switch off empty rooms
32. 32.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
34. 34.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
36. 36.🧾 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?
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) use old filament bulbs
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
40. 40.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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