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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 859 · 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 is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
  2. 2.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  3. 3.True or false: to use LED lamps saves electricity. (a) False (b) True
  4. 4.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
  6. 6.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
  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 10 hours. How many watt-hours (Wh) are saved?
  9. 9.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
  10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
  11. 11.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  12. 12.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
  15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
  16. 16.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  17. 17.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
  18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) set the AC to 24 °C
  20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  21. 21.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  22. 22.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  23. 23.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  24. 24.🧾 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?
  25. 25.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  26. 26.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  28. 28.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  29. 29.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  30. 30.True or false: to use daylight to read wastes electricity. (a) False (b) True
  31. 31.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  32. 32.🧾 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?
  33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
  34. 34.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  35. 35.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  36. 36.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  37. 37.True or false: to use LED lamps wastes electricity. (a) True (b) False
  38. 38.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) unplug idle chargers
  39. 39.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
  40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs

Answer key

  1. set the AC to 24 °C
  2. 0.25
  3. True
  4. False
  5. close the fridge quickly
  6. 140
  7. 1 kilowatt-hour (kWh)
  8. 630
  9. use old filament bulbs
  10. leave the TV on standby
  11. 1
  12. False
  13. 504
  14. use old filament bulbs
  15. leave the TV on standby
  16. True
  17. an LED lamp
  18. 340
  19. leave fridge door open
  20. wastes electricity
  21. 600
  22. 9
  23. True
  24. 567
  25. False
  26. 10
  27. wastes electricity
  28. 0.3
  29. saves electricity
  30. False
  31. False
  32. 357
  33. close the fridge quickly
  34. 0.4
  35. False
  36. True
  37. False
  38. run fans in empty rooms
  39. iron one shirt at a time
  40. use LED lamps

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