Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 559 · 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.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (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 8 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
6. 6.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
8. 8.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
10. 10.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
11. 11.🧾 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?
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) use daylight to read (d) switch off empty rooms
15. 15.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.🧾 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?
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
19. 19.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
22. 22.🧾 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?
23. 23.True or false: to leave fridge door open wastes electricity. (a) True (b) False
24. 24.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
27. 27.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
28. 28.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
31. 31.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
32. 32.True or false: to use old filament bulbs saves electricity. (a) True (b) False
33. 33.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) set the AC to 24 °C (d) close the fridge quickly
34. 34.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
37. 37.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) close the fridge quickly
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False

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