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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 530 · 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 leave the TV on standby? (a) saves electricity (b) wastes electricity
  2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
  3. 3.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  4. 4.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
  5. 5.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
  7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  8. 8.True or false: to use LED lamps wastes electricity. (a) True (b) False
  9. 9.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) use old filament bulbs
  11. 11.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  12. 12.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  16. 16.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  17. 17.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  18. 18.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  19. 19.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
  20. 20.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  22. 22.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  23. 23.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
  24. 24.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
  25. 25.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  26. 26.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  27. 27.True or false: to use LED lamps saves electricity. (a) False (b) True
  28. 28.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  29. 29.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  30. 30.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  32. 32.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  35. 35.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) iron one shirt at a time
  37. 37.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
  39. 39.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  40. 40.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby

Answer key

  1. wastes electricity
  2. an LED lamp
  3. 1
  4. use LED lamps
  5. wastes electricity
  6. 1 kilowatt-hour (kWh)
  7. wastes electricity
  8. False
  9. False
  10. use daylight to read
  11. True
  12. 1.5
  13. saves electricity
  14. 63
  15. saves electricity
  16. True
  17. 504
  18. 0.2
  19. unplug idle chargers
  20. False
  21. 204
  22. saves electricity
  23. switch off empty rooms
  24. close the fridge quickly
  25. 8
  26. 950
  27. True
  28. 20
  29. True
  30. 100
  31. 630
  32. True
  33. 408
  34. wastes electricity
  35. False
  36. iron one shirt at a time
  37. 720
  38. switch off empty rooms
  39. True
  40. unplug idle chargers

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