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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 949 · 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 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  2. 2.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
  3. 3.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
  4. 4.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  5. 5.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  6. 6.🔍 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
  7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  8. 8.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
  11. 11.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
  14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  15. 15.🧾 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?
  16. 16.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  18. 18.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
  19. 19.🧾 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?
  20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
  21. 21.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  22. 22.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
  23. 23.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
  24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
  25. 25.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  26. 26.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  27. 27.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  28. 28.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  29. 29.True or false: to use LED lamps saves electricity. (a) True (b) False
  30. 30.True or false: to leave fridge door open saves electricity. (a) True (b) False
  31. 31.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  32. 32.True or false: to use LED lamps wastes electricity. (a) False (b) True
  33. 33.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  34. 34.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
  35. 35.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  37. 37.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) use old filament bulbs
  39. 39.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  40. 40.True or false: to use daylight to read saves electricity. (a) False (b) True

Answer key

  1. 20
  2. close the fridge quickly
  3. run fans in empty rooms
  4. True
  5. True
  6. leave the TV on standby
  7. wastes electricity
  8. False
  9. 357
  10. use daylight to read
  11. False
  12. False
  13. use daylight to read
  14. saves electricity
  15. 306
  16. True
  17. wastes electricity
  18. leave fridge door open
  19. 425
  20. set the AC to 24 °C
  21. 120
  22. use old filament bulbs
  23. an LED lamp
  24. iron one shirt at a time
  25. 240
  26. 2
  27. False
  28. True
  29. True
  30. False
  31. 1.5
  32. False
  33. 765
  34. 1 kilowatt-hour (kWh)
  35. False
  36. 85
  37. saves electricity
  38. switch off empty rooms
  39. 5
  40. True

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