Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 428 · 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 run fans in empty rooms saves electricity. (a) False (b) True
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.True or false: to use LED lamps saves electricity. (a) True (b) False
5. 5.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
8. 8.🧾 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
9. 9.True or false: to close the fridge quickly saves electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) use old filament bulbs
11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
14. 14.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
16. 16.🧾 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?
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) set the AC to 24 °C (d) switch off empty rooms
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
20. 20.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.🧾 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?
23. 23.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
27. 27.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.🧾 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?
29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
31. 31.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
33. 33.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) use daylight to read
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
38. 38.True or false: to use LED lamps wastes electricity. (a) True (b) False
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
40. 40.True or false: to use old filament bulbs wastes electricity. (a) True (b) False

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