Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 285 · 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.True or false: to unplug idle chargers saves electricity. (a) False (b) True
2. 2.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
3. 3.True or false: to use old filament bulbs saves electricity. (a) True (b) False
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
7. 7.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
9. 9.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
13. 13.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) close the fridge quickly (d) use LED lamps
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
17. 17.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) set the AC to 24 °C (d) use LED lamps
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
19. 19.True or false: to use LED lamps saves electricity. (a) False (b) True
20. 20.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
21. 21.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
26. 26.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
27. 27.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
30. 30.🧾 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
31. 31.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
34. 34.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) leave the TV on standby (d) run fans in empty rooms
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
38. 38.True or false: to use LED lamps wastes electricity. (a) False (b) True
39. 39.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms

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