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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 463 · 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.True or false: to use daylight to read saves electricity. (a) True (b) False
  2. 2.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  3. 3.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
  4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  5. 5.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  6. 6.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  7. 7.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  8. 8.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  9. 9.True or false: to leave fridge door open saves electricity. (a) True (b) False
  10. 10.True or false: to use daylight to read wastes electricity. (a) False (b) True
  11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
  12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
  13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  14. 14.🧾 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?
  15. 15.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
  16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  18. 18.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  19. 19.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
  20. 20.🧾 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?
  21. 21.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
  22. 22.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  23. 23.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  24. 24.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  26. 26.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  28. 28.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  29. 29.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  30. 30.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
  32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  33. 33.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  34. 34.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  36. 36.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  37. 37.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
  38. 38.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  39. 39.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  40. 40.True or false: to switch off empty rooms saves electricity. (a) False (b) True

Answer key

  1. True
  2. False
  3. an LED lamp
  4. 68
  5. False
  6. True
  7. False
  8. True
  9. False
  10. False
  11. switch off empty rooms
  12. use LED lamps
  13. saves electricity
  14. 170
  15. use daylight to read
  16. 1 kilowatt-hour (kWh)
  17. 270
  18. True
  19. leave fridge door open
  20. 85
  21. switch off empty rooms
  22. 1170
  23. 600
  24. 8
  25. saves electricity
  26. 200
  27. 8
  28. 880
  29. 2
  30. 0.2
  31. unplug idle chargers
  32. wastes electricity
  33. 480
  34. True
  35. 490
  36. 3
  37. set the AC to 24 °C
  38. 9
  39. False
  40. True

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