Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 543 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
2. 2.True or false: to use LED lamps saves electricity. (a) True (b) False
3. 3.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
6. 6.True or false: to use old filament bulbs saves electricity. (a) True (b) False
7. 7.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.🧾 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?
9. 9.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
11. 11.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
12. 12.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
13. 13.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
18. 18.🧾 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?
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
22. 22.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
27. 27.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
28. 28.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
29. 29.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
31. 31.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
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 10 hours. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
39. 39.🧾 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?
40. 40.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) run fans in empty rooms

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