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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 847 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
  2. 2.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
  3. 3.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  4. 4.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
  5. 5.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
  6. 6.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  8. 8.🧾 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?
  9. 9.True or false: to use LED lamps wastes electricity. (a) True (b) False
  10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  11. 11.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
  12. 12.True or false: to leave fridge door open saves electricity. (a) True (b) False
  13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
  14. 14.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  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.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  17. 17.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) iron one shirt at a time
  18. 18.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  19. 19.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  20. 20.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  21. 21.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  23. 23.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  24. 24.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  25. 25.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
  26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
  30. 30.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  31. 31.True or false: to use daylight to read wastes electricity. (a) True (b) False
  32. 32.🧾 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?
  33. 33.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  34. 34.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  35. 35.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  36. 36.True or false: to use daylight to read saves electricity. (a) True (b) False
  37. 37.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  38. 38.True or false: to use LED lamps saves electricity. (a) False (b) True
  39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
  40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms

Answer key

  1. an LED lamp
  2. use old filament bulbs
  3. 5
  4. unplug idle chargers
  5. set the AC to 24 °C
  6. True
  7. 1 kilowatt-hour (kWh)
  8. 63
  9. False
  10. saves electricity
  11. use daylight to read
  12. False
  13. use LED lamps
  14. False
  15. 595
  16. saves electricity
  17. iron one shirt at a time
  18. 800
  19. 10
  20. True
  21. True
  22. 252
  23. 600
  24. 1120
  25. iron one shirt at a time
  26. wastes electricity
  27. 1440
  28. wastes electricity
  29. unplug idle chargers
  30. saves electricity
  31. False
  32. 630
  33. 1
  34. 320
  35. True
  36. True
  37. saves electricity
  38. True
  39. run fans in empty rooms
  40. leave the TV on standby

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