Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 715 · 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 of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
2. 2.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
5. 5.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) unplug idle chargers (d) set the AC to 24 °C
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
16. 16.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
17. 17.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
18. 18.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) use LED lamps (d) set the AC to 24 °C
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
22. 22.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
23. 23.True or false: to use daylight to read wastes electricity. (a) False (b) True
24. 24.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
26. 26.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
28. 28.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
29. 29.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
30. 30.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.🧾 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?
33. 33.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
34. 34.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
35. 35.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
36. 36.True or false: to leave fridge door open saves electricity. (a) False (b) True
37. 37.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
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 4 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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