Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 818 · 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 of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
4. 4.🧾 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?
5. 5.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 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?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
10. 10.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
12. 12.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
13. 13.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) set the AC to 24 °C (d) use old filament bulbs
15. 15.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) set the AC to 24 °C
17. 17.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
19. 19.🧾 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?
20. 20.🧾 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?
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
28. 28.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
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 5 hours. How many watt-hours (Wh) are saved?
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) iron one shirt at a time
36. 36.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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