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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 869 · 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) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) leave fridge door open
  2. 2.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
  3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  5. 5.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  6. 6.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
  8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
  10. 10.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  12. 12.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  13. 13.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  14. 14.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) leave the TV on standby
  18. 18.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  21. 21.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
  23. 23.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
  24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) switch off empty rooms (d) set the AC to 24 °C
  26. 26.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
  28. 28.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  29. 29.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  30. 30.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  31. 31.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  32. 32.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
  33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  34. 34.🧾 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?
  35. 35.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
  37. 37.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
  38. 38.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) use old filament bulbs
  39. 39.🧾 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?
  40. 40.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. switch off empty rooms
  2. run fans in empty rooms
  3. 238
  4. saves electricity
  5. True
  6. 4
  7. use daylight to read
  8. 595
  9. leave fridge door open
  10. 0.1
  11. saves electricity
  12. 300
  13. 5
  14. 2
  15. 520
  16. saves electricity
  17. leave the TV on standby
  18. False
  19. 255
  20. saves electricity
  21. 0.5
  22. 1 kilowatt-hour (kWh)
  23. an LED lamp
  24. saves electricity
  25. leave fridge door open
  26. 10
  27. switch off empty rooms
  28. 80
  29. True
  30. 1.2
  31. True
  32. use LED lamps
  33. 240
  34. 126
  35. 400
  36. unplug idle chargers
  37. iron one shirt at a time
  38. use old filament bulbs
  39. 102
  40. 15

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