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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 183 · 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 old filament bulbs wastes electricity. (a) False (b) True
  2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
  3. 3.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  4. 4.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) run fans in empty rooms
  5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
  6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
  8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) unplug idle chargers (d) close the fridge quickly
  9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  10. 10.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  11. 11.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  12. 12.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  14. 14.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
  16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  17. 17.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  18. 18.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  21. 21.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
  23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  24. 24.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
  25. 25.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  26. 26.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  27. 27.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  28. 28.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  29. 29.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
  30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers
  31. 31.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
  32. 32.True or false: to use LED lamps saves electricity. (a) False (b) True
  33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
  34. 34.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  35. 35.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
  36. 36.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
  37. 37.True or false: to use LED lamps wastes electricity. (a) False (b) True
  38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  39. 39.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
  40. 40.True or false: to unplug idle chargers saves electricity. (a) True (b) False

Answer key

  1. True
  2. 1 kilowatt-hour (kWh)
  3. 12
  4. run fans in empty rooms
  5. an LED lamp
  6. saves electricity
  7. use daylight to read
  8. iron one shirt at a time
  9. wastes electricity
  10. False
  11. False
  12. True
  13. wastes electricity
  14. saves electricity
  15. use old filament bulbs
  16. saves electricity
  17. 120
  18. 600
  19. 255
  20. wastes electricity
  21. True
  22. leave the TV on standby
  23. saves electricity
  24. run fans in empty rooms
  25. 0.25
  26. 1
  27. 450
  28. True
  29. leave fridge door open
  30. leave fridge door open
  31. close the fridge quickly
  32. True
  33. use old filament bulbs
  34. True
  35. set the AC to 24 °C
  36. unplug idle chargers
  37. False
  38. saves electricity
  39. unplug idle chargers
  40. True

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