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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 871 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
  2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
  3. 3.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  5. 5.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  6. 6.True or false: to leave fridge door open saves electricity. (a) True (b) False
  7. 7.🧾 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?
  8. 8.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  9. 9.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  10. 10.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  12. 12.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  13. 13.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
  15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) unplug idle chargers
  17. 17.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
  18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  19. 19.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  20. 20.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  23. 23.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  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 3 hours. How many watt-hours (Wh) are saved?
  25. 25.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
  27. 27.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
  28. 28.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  29. 29.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  31. 31.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
  33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
  34. 34.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  35. 35.Which of these wastes electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) use LED lamps (d) set the AC to 24 °C
  36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
  37. 37.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) leave fridge door open (d) use old filament bulbs
  38. 38.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  39. 39.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

Answer key

  1. 1 kilowatt-hour (kWh)
  2. an LED lamp
  3. False
  4. wastes electricity
  5. 350
  6. False
  7. 255
  8. 720
  9. 120
  10. 0.5
  11. wastes electricity
  12. 2.5
  13. True
  14. use old filament bulbs
  15. wastes electricity
  16. leave fridge door open
  17. set the AC to 24 °C
  18. saves electricity
  19. True
  20. False
  21. saves electricity
  22. saves electricity
  23. 400
  24. 102
  25. 1440
  26. unplug idle chargers
  27. switch off empty rooms
  28. saves electricity
  29. 0.5
  30. wastes electricity
  31. False
  32. switch off empty rooms
  33. close the fridge quickly
  34. True
  35. run fans in empty rooms
  36. run fans in empty rooms
  37. use daylight to read
  38. 1260
  39. 880
  40. 780

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