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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 51 · 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) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
  2. 2.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) leave the TV on standby
  3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) unplug idle chargers
  4. 4.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
  5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  6. 6.True or false: to leave fridge door open saves electricity. (a) True (b) False
  7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
  10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
  11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
  12. 12.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
  14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
  15. 15.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  16. 16.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
  18. 18.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  19. 19.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
  20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  21. 21.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  23. 23.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
  25. 25.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  26. 26.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  27. 27.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  29. 29.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
  31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  32. 32.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  33. 33.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  34. 34.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  36. 36.True or false: to use LED lamps wastes electricity. (a) True (b) False
  37. 37.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  38. 38.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  39. 39.True or false: to use daylight to read saves electricity. (a) False (b) True
  40. 40.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms

Answer key

  1. set the AC to 24 °C
  2. leave the TV on standby
  3. run fans in empty rooms
  4. close the fridge quickly
  5. saves electricity
  6. False
  7. 441
  8. wastes electricity
  9. 1 kilowatt-hour (kWh)
  10. an LED lamp
  11. close the fridge quickly
  12. 4
  13. use LED lamps
  14. use daylight to read
  15. False
  16. saves electricity
  17. leave the TV on standby
  18. 200
  19. switch off empty rooms
  20. saves electricity
  21. False
  22. wastes electricity
  23. 250
  24. switch off empty rooms
  25. 990
  26. False
  27. 9
  28. wastes electricity
  29. True
  30. unplug idle chargers
  31. saves electricity
  32. 0.2
  33. True
  34. 520
  35. wastes electricity
  36. False
  37. 1200
  38. True
  39. True
  40. use daylight to read

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