Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 630 · 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 set the AC to 24 °C wastes electricity. (a) False (b) True
2. 2.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
4. 4.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) set the AC to 24 °C (d) close the fridge quickly
6. 6.True or false: to use daylight to read saves electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) use old filament bulbs
8. 8.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
9. 9.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
14. 14.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
16. 16.True or false: to use LED lamps saves electricity. (a) False (b) True
17. 17.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
18. 18.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
20. 20.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) leave the TV on standby (d) use old filament bulbs
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
24. 24.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
25. 25.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
28. 28.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
31. 31.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
33. 33.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
34. 34.True or false: to use old filament bulbs saves electricity. (a) True (b) False
35. 35.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
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 2 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 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?
38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) use old filament bulbs

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