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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 732 · 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.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  3. 3.🧾 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
  4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  5. 5.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
  6. 6.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  7. 7.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  8. 8.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
  9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  10. 10.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  11. 11.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  12. 12.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
  13. 13.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  14. 14.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  15. 15.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
  16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
  17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) set the AC to 24 °C
  18. 18.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  20. 20.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
  21. 21.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
  22. 22.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
  23. 23.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  24. 24.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
  25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  26. 26.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
  27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) set the AC to 24 °C
  28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
  29. 29.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  30. 30.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  31. 31.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  32. 32.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  34. 34.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  35. 35.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
  37. 37.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  39. 39.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  40. 40.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. wastes electricity
  2. saves electricity
  3. an LED lamp
  4. saves electricity
  5. iron one shirt at a time
  6. 720
  7. False
  8. use LED lamps
  9. saves electricity
  10. saves electricity
  11. 0.5
  12. leave fridge door open
  13. 450
  14. 850
  15. set the AC to 24 °C
  16. unplug idle chargers
  17. leave fridge door open
  18. 5
  19. 7.5
  20. use daylight to read
  21. close the fridge quickly
  22. switch off empty rooms
  23. 0.6
  24. run fans in empty rooms
  25. saves electricity
  26. leave the TV on standby
  27. run fans in empty rooms
  28. iron one shirt at a time
  29. saves electricity
  30. False
  31. False
  32. True
  33. wastes electricity
  34. 240
  35. True
  36. close the fridge quickly
  37. 16
  38. wastes electricity
  39. 320
  40. 0.5

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