Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 452 · 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 6 hours. How many watt-hours (Wh) are saved?
2. 2.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
5. 5.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
7. 7.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
8. 8.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 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
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
14. 14.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
15. 15.True or false: to switch off empty rooms saves electricity. (a) False (b) True
16. 16.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) use LED lamps
19. 19.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to use old filament bulbs saves electricity. (a) True (b) False
21. 21.🧾 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?
22. 22.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
23. 23.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to unplug idle chargers saves electricity. (a) True (b) False
25. 25.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
27. 27.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
29. 29.True or false: to use LED lamps saves electricity. (a) True (b) False
30. 30.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
34. 34.True or false: to leave the TV on standby saves electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
36. 36.True or false: to close the fridge quickly saves electricity. (a) False (b) True
37. 37.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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