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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 746 · 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 is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
  2. 2.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  4. 4.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  5. 5.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
  7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) close the fridge quickly
  8. 8.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
  9. 9.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  11. 11.🧾 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
  12. 12.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  14. 14.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  16. 16.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  17. 17.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  18. 18.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  19. 19.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
  20. 20.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
  22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
  23. 23.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  24. 24.True or false: to use LED lamps wastes electricity. (a) False (b) True
  25. 25.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  26. 26.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  27. 27.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  28. 28.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  29. 29.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
  30. 30.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  31. 31.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  33. 33.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  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 iron one shirt at a time? (a) saves electricity (b) wastes electricity
  36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  37. 37.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
  38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
  39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  40. 40.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms

Answer key

  1. unplug idle chargers
  2. True
  3. saves electricity
  4. saves electricity
  5. 240
  6. 1 kilowatt-hour (kWh)
  7. iron one shirt at a time
  8. run fans in empty rooms
  9. 600
  10. 85
  11. an LED lamp
  12. 5
  13. wastes electricity
  14. saves electricity
  15. 567
  16. 10
  17. 1080
  18. 300
  19. iron one shirt at a time
  20. 9
  21. set the AC to 24 °C
  22. run fans in empty rooms
  23. True
  24. False
  25. True
  26. True
  27. 480
  28. 0.5
  29. use LED lamps
  30. False
  31. 0.1
  32. wastes electricity
  33. True
  34. False
  35. wastes electricity
  36. 126
  37. use old filament bulbs
  38. use LED lamps
  39. 102
  40. switch off empty rooms

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