Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 239 · 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.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
2. 2.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) leave the TV on standby
3. 3.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
5. 5.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
11. 11.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
13. 13.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
14. 14.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
15. 15.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
16. 16.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
19. 19.True or false: to use daylight to read saves electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
21. 21.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
23. 23.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
27. 27.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
29. 29.🧾 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?
30. 30.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) leave the TV on standby (d) set the AC to 24 °C
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
32. 32.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
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 7 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to use LED lamps saves electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
36. 36.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.True or false: to switch off empty rooms saves electricity. (a) True (b) False
39. 39.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) switch off empty rooms (d) leave the TV on standby
40. 40.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity

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