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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 692 · 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 use LED lamps? (a) saves electricity (b) wastes electricity
  2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
  3. 3.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
  4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
  6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  7. 7.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) unplug idle chargers (d) iron one shirt at a time
  8. 8.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
  9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
  10. 10.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  11. 11.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
  12. 12.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
  13. 13.True or false: to use daylight to read wastes electricity. (a) False (b) True
  14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
  15. 15.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
  16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use daylight to read (d) unplug idle chargers
  17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  18. 18.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
  19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  20. 20.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
  22. 22.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  23. 23.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  24. 24.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  26. 26.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  28. 28.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  29. 29.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  30. 30.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
  31. 31.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  32. 32.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  33. 33.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
  34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
  35. 35.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  36. 36.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  37. 37.True or false: to use LED lamps wastes electricity. (a) True (b) False
  38. 38.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  40. 40.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly

Answer key

  1. saves electricity
  2. use daylight to read
  3. switch off empty rooms
  4. saves electricity
  5. close the fridge quickly
  6. wastes electricity
  7. iron one shirt at a time
  8. set the AC to 24 °C
  9. set the AC to 24 °C
  10. 160
  11. switch off empty rooms
  12. unplug idle chargers
  13. False
  14. use daylight to read
  15. leave the TV on standby
  16. leave fridge door open
  17. wastes electricity
  18. 1 kilowatt-hour (kWh)
  19. 1080
  20. 0.2
  21. use old filament bulbs
  22. 9
  23. 0.4
  24. 100
  25. saves electricity
  26. False
  27. wastes electricity
  28. 0.1
  29. True
  30. an LED lamp
  31. True
  32. False
  33. use LED lamps
  34. use LED lamps
  35. False
  36. False
  37. False
  38. 600
  39. 720
  40. close the fridge quickly

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