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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 46 · 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.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  2. 2.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
  4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
  5. 5.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
  6. 6.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  7. 7.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
  9. 9.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  10. 10.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
  12. 12.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
  13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
  14. 14.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
  15. 15.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) close the fridge quickly (d) leave fridge door open
  16. 16.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
  17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
  19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use daylight to read (d) iron one shirt at a time
  20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
  21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  22. 22.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  23. 23.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  24. 24.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  25. 25.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  26. 26.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  27. 27.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  28. 28.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
  29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  30. 30.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  31. 31.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
  32. 32.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
  33. 33.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  34. 34.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave the TV on standby
  36. 36.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  37. 37.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave fridge door open (d) use daylight to read
  38. 38.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
  39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  40. 40.True or false: to switch off empty rooms wastes electricity. (a) True (b) False

Answer key

  1. saves electricity
  2. False
  3. iron one shirt at a time
  4. 1 kilowatt-hour (kWh)
  5. switch off empty rooms
  6. 12
  7. 7.5
  8. set the AC to 24 °C
  9. 0.5
  10. 8
  11. use old filament bulbs
  12. run fans in empty rooms
  13. leave the TV on standby
  14. an LED lamp
  15. leave fridge door open
  16. use daylight to read
  17. saves electricity
  18. use LED lamps
  19. use daylight to read
  20. run fans in empty rooms
  21. wastes electricity
  22. 1710
  23. 0.25
  24. False
  25. False
  26. 200
  27. 0.6
  28. close the fridge quickly
  29. 350
  30. True
  31. leave the TV on standby
  32. use LED lamps
  33. 400
  34. 210
  35. set the AC to 24 °C
  36. saves electricity
  37. leave fridge door open
  38. unplug idle chargers
  39. saves electricity
  40. False

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