Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 762 · 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) close the fridge quickly (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
3. 3.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
5. 5.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
7. 7.True or false: to close the fridge quickly saves electricity. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
9. 9.🧾 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?
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
12. 12.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
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 10 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
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 LED lamps? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
19. 19.True or false: to leave fridge door open wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
21. 21.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
24. 24.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🧾 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?
26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
29. 29.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to leave fridge door open saves electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
32. 32.🧾 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?
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) set the AC to 24 °C
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 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?

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