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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 677 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  2. 2.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
  4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
  5. 5.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  6. 6.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
  7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
  9. 9.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
  10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  12. 12.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
  13. 13.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
  14. 14.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  16. 16.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
  17. 17.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  18. 18.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  19. 19.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  20. 20.True or false: to use LED lamps wastes electricity. (a) True (b) False
  21. 21.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  23. 23.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  24. 24.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  25. 25.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
  26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
  27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  28. 28.🧾 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?
  29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  30. 30.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  31. 31.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
  32. 32.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  35. 35.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  37. 37.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) use daylight to read
  38. 38.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  39. 39.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs

Answer key

  1. 1 kilowatt-hour (kWh)
  2. 510
  3. iron one shirt at a time
  4. leave the TV on standby
  5. 280
  6. use LED lamps
  7. 34
  8. leave fridge door open
  9. close the fridge quickly
  10. saves electricity
  11. wastes electricity
  12. an LED lamp
  13. iron one shirt at a time
  14. 0.2
  15. wastes electricity
  16. unplug idle chargers
  17. True
  18. 1080
  19. 800
  20. False
  21. 10
  22. 960
  23. False
  24. 2.5
  25. run fans in empty rooms
  26. use daylight to read
  27. wastes electricity
  28. 567
  29. saves electricity
  30. True
  31. switch off empty rooms
  32. 1.25
  33. wastes electricity
  34. wastes electricity
  35. 15
  36. 0.2
  37. leave the TV on standby
  38. 4
  39. True
  40. use old filament bulbs

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