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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 865 · 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 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
  2. 2.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
  3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
  4. 4.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) use daylight to read
  6. 6.🧾 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?
  7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
  8. 8.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
  9. 9.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  10. 10.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
  11. 11.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  12. 12.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  13. 13.True or false: to use LED lamps wastes electricity. (a) True (b) False
  14. 14.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  16. 16.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
  18. 18.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  19. 19.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
  22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
  24. 24.True or false: to use LED lamps saves electricity. (a) False (b) True
  25. 25.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  26. 26.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
  27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  28. 28.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  29. 29.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  32. 32.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
  34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  35. 35.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  37. 37.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) run fans in empty rooms
  39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  40. 40.True or false: to leave fridge door open wastes electricity. (a) True (b) False

Answer key

  1. set the AC to 24 °C
  2. use old filament bulbs
  3. leave fridge door open
  4. 360
  5. use old filament bulbs
  6. 102
  7. set the AC to 24 °C
  8. leave fridge door open
  9. 1.2
  10. an LED lamp
  11. saves electricity
  12. 300
  13. False
  14. False
  15. saves electricity
  16. False
  17. use LED lamps
  18. True
  19. 0.8
  20. wastes electricity
  21. leave the TV on standby
  22. 720
  23. iron one shirt at a time
  24. True
  25. 0.5
  26. unplug idle chargers
  27. saves electricity
  28. 600
  29. True
  30. False
  31. 357
  32. 4
  33. switch off empty rooms
  34. 51
  35. False
  36. wastes electricity
  37. 180
  38. run fans in empty rooms
  39. wastes electricity
  40. True

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