Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 634 · 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 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
2. 2.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
3. 3.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
5. 5.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) run fans in empty rooms
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
14. 14.True or false: to switch off empty rooms saves electricity. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) use LED lamps (d) close the fridge quickly
16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
17. 17.Which of these wastes electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers
18. 18.🧾 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?
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) close the fridge quickly (d) use daylight to read
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
21. 21.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 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?
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
26. 26.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
27. 27.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) iron one shirt at a time
31. 31.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to use LED lamps wastes electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
39. 39.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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