Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 355 · 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 switch off empty rooms wastes electricity. (a) False (b) True
2. 2.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
4. 4.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
5. 5.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) close the fridge quickly
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
12. 12.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
13. 13.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
14. 14.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
15. 15.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) use old filament bulbs
17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
18. 18.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
20. 20.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
27. 27.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) leave the TV on standby
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
32. 32.True or false: to unplug idle chargers saves electricity. (a) False (b) True
33. 33.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 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?
36. 36.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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