Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 99 · 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 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
6. 6.True or false: to use daylight to read wastes electricity. (a) True (b) False
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
8. 8.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
9. 9.🧾 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?
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
11. 11.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 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
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
18. 18.🧾 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?
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
20. 20.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
21. 21.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.🧾 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?
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
24. 24.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
25. 25.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
27. 27.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) set the AC to 24 °C (d) close the fridge quickly
28. 28.True or false: to leave fridge door open saves electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
30. 30.🧾 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?
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
35. 35.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) run fans in empty rooms
36. 36.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
38. 38.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) close the fridge quickly (d) use daylight to read

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