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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 400 · 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 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
  2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
  3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
  4. 4.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use LED lamps
  6. 6.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  7. 7.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
  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.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  10. 10.True or false: to leave fridge door open saves electricity. (a) True (b) False
  11. 11.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  12. 12.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
  13. 13.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  14. 14.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
  17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
  18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
  19. 19.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  22. 22.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  23. 23.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  24. 24.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) switch off empty rooms
  26. 26.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) use daylight to read
  27. 27.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  28. 28.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
  29. 29.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
  31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  32. 32.🧾 A 500 W appliance runs for 6 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.True or false: to use LED lamps wastes electricity. (a) False (b) True
  35. 35.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) close the fridge quickly
  37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  38. 38.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
  39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open

Answer key

  1. 1 kilowatt-hour (kWh)
  2. an LED lamp
  3. iron one shirt at a time
  4. False
  5. use LED lamps
  6. 2
  7. run fans in empty rooms
  8. 595
  9. False
  10. False
  11. saves electricity
  12. close the fridge quickly
  13. False
  14. True
  15. wastes electricity
  16. unplug idle chargers
  17. switch off empty rooms
  18. use LED lamps
  19. 360
  20. wastes electricity
  21. saves electricity
  22. False
  23. True
  24. 120
  25. switch off empty rooms
  26. leave the TV on standby
  27. 900
  28. set the AC to 24 °C
  29. 0.5
  30. leave the TV on standby
  31. saves electricity
  32. 3
  33. wastes electricity
  34. False
  35. 1
  36. leave fridge door open
  37. 315
  38. use old filament bulbs
  39. saves electricity
  40. set the AC to 24 °C

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