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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 920 · 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 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  4. 4.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) run fans in empty rooms
  5. 5.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  6. 6.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
  8. 8.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  10. 10.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  11. 11.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
  12. 12.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
  14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
  15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) switch off empty rooms
  16. 16.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
  17. 17.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  18. 18.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  19. 19.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
  20. 20.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) close the fridge quickly
  21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  23. 23.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  24. 24.True or false: to use LED lamps wastes electricity. (a) True (b) False
  25. 25.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
  27. 27.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
  29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  31. 31.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  32. 32.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
  34. 34.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  36. 36.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
  37. 37.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
  39. 39.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
  40. 40.True or false: to leave fridge door open wastes electricity. (a) False (b) True

Answer key

  1. 6
  2. saves electricity
  3. saves electricity
  4. use daylight to read
  5. saves electricity
  6. 5
  7. run fans in empty rooms
  8. 0.1
  9. wastes electricity
  10. False
  11. set the AC to 24 °C
  12. False
  13. leave fridge door open
  14. iron one shirt at a time
  15. use old filament bulbs
  16. run fans in empty rooms
  17. 0.25
  18. True
  19. switch off empty rooms
  20. use old filament bulbs
  21. saves electricity
  22. saves electricity
  23. 320
  24. False
  25. 5
  26. leave the TV on standby
  27. 20
  28. iron one shirt at a time
  29. saves electricity
  30. wastes electricity
  31. 560
  32. 2.5
  33. an LED lamp
  34. 0.8
  35. 240
  36. 1 kilowatt-hour (kWh)
  37. False
  38. unplug idle chargers
  39. leave fridge door open
  40. True

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