Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 11 · 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) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
2. 2.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
3. 3.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
8. 8.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
10. 10.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
11. 11.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
14. 14.🧾 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?
15. 15.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
21. 21.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
22. 22.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
25. 25.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 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?
27. 27.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
28. 28.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
33. 33.🧾 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?
34. 34.🧾 A 50 W appliance runs for 4 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) use LED lamps (d) use old filament bulbs
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
38. 38.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open

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