Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 627 · 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.🧾 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?
2. 2.🧾 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
3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
9. 9.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) close the fridge quickly
14. 14.True or false: to run fans in empty rooms wastes 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.True or false: to leave the TV on standby saves electricity. (a) False (b) True
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.True or false: to close the fridge quickly saves electricity. (a) False (b) True
21. 21.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
22. 22.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) use old filament bulbs
27. 27.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) use old filament bulbs
28. 28.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
31. 31.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
32. 32.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.True or false: to use LED lamps wastes electricity. (a) True (b) False
38. 38.🧾 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?
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity

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