Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 101 · 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 is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
4. 4.🧾 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?
5. 5.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
6. 6.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
7. 7.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
14. 14.True or false: to close the fridge quickly saves electricity. (a) True (b) False
15. 15.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
17. 17.🧾 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?
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
20. 20.True or false: to leave fridge door open saves electricity. (a) False (b) True
21. 21.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
22. 22.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
23. 23.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to use daylight to read wastes electricity. (a) False (b) True
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) use LED lamps
33. 33.🧾 A 40 W filament bulb is swapped for a 6 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 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
38. 38.🧾 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?
39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly

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