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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 275 · 40 questions
TalentJR

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.

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  1. 1.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) use LED lamps (d) set the AC to 24 °C
  2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
  3. 3.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  4. 4.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
  5. 5.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
  7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  8. 8.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  9. 9.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
  10. 10.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  11. 11.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
  13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  14. 14.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  15. 15.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
  16. 16.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  17. 17.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
  18. 18.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  19. 19.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  20. 20.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  21. 21.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
  22. 22.True or false: to use LED lamps saves electricity. (a) False (b) True
  23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
  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 4 hours. How many watt-hours (Wh) are saved?
  25. 25.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  26. 26.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
  27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  28. 28.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  29. 29.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  30. 30.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
  31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  32. 32.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  33. 33.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  34. 34.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  36. 36.True or false: to use LED lamps wastes electricity. (a) True (b) False
  37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
  39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) use old filament bulbs
  40. 40.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity

Answer key

  1. use old filament bulbs
  2. 1 kilowatt-hour (kWh)
  3. 0.5
  4. an LED lamp
  5. False
  6. run fans in empty rooms
  7. wastes electricity
  8. False
  9. close the fridge quickly
  10. 640
  11. 280
  12. use LED lamps
  13. saves electricity
  14. True
  15. switch off empty rooms
  16. saves electricity
  17. iron one shirt at a time
  18. False
  19. 900
  20. 540
  21. unplug idle chargers
  22. True
  23. leave the TV on standby
  24. 136
  25. True
  26. set the AC to 24 °C
  27. 315
  28. 680
  29. 1.25
  30. use LED lamps
  31. wastes electricity
  32. 270
  33. False
  34. False
  35. wastes electricity
  36. False
  37. 240
  38. unplug idle chargers
  39. use old filament bulbs
  40. saves electricity

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