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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 662 · 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 switch off empty rooms saves electricity. (a) True (b) False
  2. 2.🧾 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
  3. 3.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
  4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) use old filament bulbs
  5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
  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.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  8. 8.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) close the fridge quickly (d) switch off empty rooms
  10. 10.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  11. 11.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
  12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  14. 14.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  15. 15.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
  16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
  17. 17.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  18. 18.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) switch off empty rooms
  20. 20.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
  22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  23. 23.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
  27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) run fans in empty rooms (d) use LED lamps
  28. 28.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  29. 29.True or false: to use LED lamps saves electricity. (a) True (b) False
  30. 30.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  31. 31.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  32. 32.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  35. 35.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
  36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
  37. 37.True or false: to use daylight to read wastes electricity. (a) False (b) True
  38. 38.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
  39. 39.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
  40. 40.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True

Answer key

  1. True
  2. an LED lamp
  3. set the AC to 24 °C
  4. use old filament bulbs
  5. close the fridge quickly
  6. 102
  7. False
  8. 1040
  9. leave the TV on standby
  10. 0.5
  11. 1 kilowatt-hour (kWh)
  12. wastes electricity
  13. wastes electricity
  14. False
  15. unplug idle chargers
  16. use LED lamps
  17. 250
  18. False
  19. run fans in empty rooms
  20. 160
  21. set the AC to 24 °C
  22. 300
  23. False
  24. saves electricity
  25. saves electricity
  26. use LED lamps
  27. run fans in empty rooms
  28. 8
  29. True
  30. 6
  31. False
  32. 3
  33. 1600
  34. 700
  35. leave fridge door open
  36. leave fridge door open
  37. False
  38. switch off empty rooms
  39. use daylight to read
  40. True

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