Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 34 · 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 leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) set the AC to 24 °C (d) run fans in empty rooms
4. 4.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
6. 6.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
8. 8.True or false: to use LED lamps saves electricity. (a) False (b) True
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
10. 10.True or false: to use daylight to read wastes electricity. (a) False (b) True
11. 11.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers
13. 13.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
14. 14.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) switch off empty rooms
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
17. 17.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to use old filament bulbs saves electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
21. 21.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use old filament bulbs (d) iron one shirt at a time
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
26. 26.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
27. 27.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) use old filament bulbs (d) use daylight to read
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
40. 40.True or false: to leave the TV on standby saves electricity. (a) True (b) False

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