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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 779 · 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) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
  2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
  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 6 hours. How many watt-hours (Wh) are saved?
  4. 4.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
  5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  7. 7.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
  8. 8.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use daylight to read (d) switch off empty rooms
  10. 10.🧾 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?
  11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
  12. 12.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  13. 13.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
  14. 14.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
  15. 15.🧾 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?
  16. 16.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  17. 17.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  19. 19.True or false: to use LED lamps wastes electricity. (a) False (b) True
  20. 20.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
  21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  22. 22.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  23. 23.🧾 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?
  24. 24.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  25. 25.🧾 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?
  26. 26.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  27. 27.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  28. 28.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
  30. 30.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
  31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  32. 32.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
  34. 34.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  35. 35.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  36. 36.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) set the AC to 24 °C (d) use old filament bulbs
  37. 37.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  40. 40.True or false: to unplug idle chargers saves electricity. (a) True (b) False

Answer key

  1. set the AC to 24 °C
  2. run fans in empty rooms
  3. 204
  4. unplug idle chargers
  5. wastes electricity
  6. wastes electricity
  7. an LED lamp
  8. False
  9. leave fridge door open
  10. 102
  11. False
  12. 320
  13. set the AC to 24 °C
  14. use daylight to read
  15. 595
  16. 8
  17. False
  18. 378
  19. False
  20. 1 kilowatt-hour (kWh)
  21. saves electricity
  22. 1350
  23. 504
  24. True
  25. 567
  26. False
  27. 20
  28. True
  29. switch off empty rooms
  30. leave the TV on standby
  31. False
  32. True
  33. use LED lamps
  34. False
  35. 0.25
  36. use old filament bulbs
  37. 0.8
  38. 1050
  39. 760
  40. True

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