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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 142 · 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.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
  3. 3.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
  5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
  6. 6.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  7. 7.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
  8. 8.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
  10. 10.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  11. 11.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
  13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
  14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  15. 15.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
  17. 17.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
  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 10 hours. How many watt-hours (Wh) are saved?
  19. 19.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  20. 20.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  22. 22.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  23. 23.🔍 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) switch off empty rooms
  24. 24.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  25. 25.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
  29. 29.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  30. 30.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  31. 31.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  32. 32.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  33. 33.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs
  34. 34.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  36. 36.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  37. 37.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  39. 39.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  40. 40.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms

Answer key

  1. False
  2. set the AC to 24 °C
  3. 2
  4. iron one shirt at a time
  5. switch off empty rooms
  6. 0.4
  7. an LED lamp
  8. 6
  9. use LED lamps
  10. 120
  11. 1170
  12. leave the TV on standby
  13. leave the TV on standby
  14. saves electricity
  15. 360
  16. use old filament bulbs
  17. run fans in empty rooms
  18. 850
  19. True
  20. True
  21. 510
  22. True
  23. switch off empty rooms
  24. 0.5
  25. saves electricity
  26. 1260
  27. wastes electricity
  28. unplug idle chargers
  29. 1
  30. 10
  31. 0.25
  32. True
  33. close the fridge quickly
  34. False
  35. wastes electricity
  36. 900
  37. False
  38. 360
  39. 780
  40. use daylight to read

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