Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 182 · 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 iron one shirt at a time? (a) saves electricity (b) wastes electricity
2. 2.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
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 8 hours. How many watt-hours (Wh) are saved?
8. 8.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
10. 10.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) unplug idle chargers
11. 11.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
12. 12.True or false: to close the fridge quickly saves electricity. (a) True (b) False
13. 13.🧾 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?
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) close the fridge quickly (d) set the AC to 24 °C
17. 17.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
19. 19.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
21. 21.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
23. 23.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
26. 26.True or false: to switch off empty rooms saves electricity. (a) True (b) False
27. 27.True or false: to leave fridge door open saves electricity. (a) True (b) False
28. 28.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) leave the TV on standby
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to use daylight to read wastes electricity. (a) False (b) True
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
34. 34.True or false: to unplug idle chargers saves electricity. (a) True (b) False
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
37. 37.True or false: to use daylight to read saves electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
39. 39.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity

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