Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 898 · 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.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
2. 2.True or false: to use old filament bulbs saves electricity. (a) False (b) True
3. 3.True or false: to use daylight to read wastes electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) leave fridge door open (d) run fans in empty rooms
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
6. 6.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
8. 8.True or false: to leave fridge door open saves electricity. (a) False (b) True
9. 9.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
10. 10.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) set the AC to 24 °C (d) switch off empty rooms
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) close the fridge quickly
13. 13.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
17. 17.🧾 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?
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
22. 22.True or false: to use LED lamps saves electricity. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) unplug idle chargers (d) close the fridge quickly
24. 24.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) leave fridge door open
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
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 set the AC to 24 °C? (a) saves electricity (b) wastes electricity
34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
36. 36.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
37. 37.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use daylight to read (d) close the fridge quickly
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to close the fridge quickly saves electricity. (a) False (b) True
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps

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