Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 294 · 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 the TV on standby (c) switch off empty rooms (d) use LED lamps
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
3. 3.True or false: to leave the TV on standby saves electricity. (a) True (b) False
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 2 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
8. 8.True or false: to close the fridge quickly saves electricity. (a) False (b) True
9. 9.🧾 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
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
11. 11.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
12. 12.🧾 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?
13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
15. 15.True or false: to use LED lamps saves electricity. (a) True (b) False
16. 16.True or false: to use daylight to read saves electricity. (a) False (b) True
17. 17.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.🧾 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?
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
21. 21.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) run fans in empty rooms
24. 24.🧾 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?
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
26. 26.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
27. 27.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
31. 31.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time
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 2 hours. How many watt-hours (Wh) are saved?
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
39. 39.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
40. 40.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open

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