Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 775 · 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 is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
8. 8.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
10. 10.True or false: to use LED lamps wastes electricity. (a) True (b) False
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
14. 14.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
18. 18.True or false: to unplug idle chargers saves electricity. (a) True (b) False
19. 19.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
20. 20.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🧾 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?
23. 23.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.True or false: to use LED lamps saves electricity. (a) True (b) False
26. 26.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
28. 28.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use old filament bulbs (d) switch off empty rooms
29. 29.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
31. 31.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.True or false: to leave fridge door open saves electricity. (a) True (b) False
33. 33.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
35. 35.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 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?

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