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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 643 · 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.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  2. 2.🧾 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?
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
  4. 4.True or false: to use LED lamps wastes electricity. (a) False (b) True
  5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
  7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) leave fridge door open (d) leave the TV on standby
  8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
  9. 9.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  10. 10.True or false: to use daylight to read wastes electricity. (a) True (b) False
  11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  12. 12.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  13. 13.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  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 2 hours. How many watt-hours (Wh) are saved?
  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 5 hours. How many watt-hours (Wh) are saved?
  16. 16.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
  17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) leave the TV on standby
  18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
  19. 19.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  20. 20.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
  21. 21.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) run fans in empty rooms
  23. 23.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  24. 24.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  26. 26.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  28. 28.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  29. 29.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  30. 30.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  31. 31.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) use old filament bulbs
  33. 33.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
  35. 35.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  36. 36.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) unplug idle chargers

Answer key

  1. 0.1
  2. 315
  3. 1 kilowatt-hour (kWh)
  4. False
  5. 1120
  6. use daylight to read
  7. close the fridge quickly
  8. an LED lamp
  9. 306
  10. False
  11. wastes electricity
  12. 2.5
  13. 240
  14. 126
  15. 425
  16. iron one shirt at a time
  17. switch off empty rooms
  18. close the fridge quickly
  19. 1.5
  20. leave the TV on standby
  21. 16
  22. run fans in empty rooms
  23. 0.4
  24. 720
  25. 100
  26. True
  27. wastes electricity
  28. 840
  29. 170
  30. 1080
  31. True
  32. use daylight to read
  33. 1.2
  34. set the AC to 24 °C
  35. 120
  36. 0.5
  37. 1
  38. 270
  39. wastes electricity
  40. leave the TV on standby

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