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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 932 · 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 run fans in empty rooms saves electricity. (a) True (b) False
  2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
  3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
  4. 4.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
  5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
  6. 6.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  7. 7.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
  9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
  10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  12. 12.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  13. 13.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  14. 14.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
  15. 15.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  16. 16.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  18. 18.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
  20. 20.True or false: to use LED lamps saves electricity. (a) False (b) True
  21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  22. 22.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  23. 23.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  24. 24.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) switch off empty rooms (d) use LED lamps
  27. 27.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  28. 28.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  29. 29.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  30. 30.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
  31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  33. 33.True or false: to use LED lamps wastes electricity. (a) False (b) True
  34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
  35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
  37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  39. 39.🧾 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?
  40. 40.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open

Answer key

  1. False
  2. an LED lamp
  3. use old filament bulbs
  4. switch off empty rooms
  5. switch off empty rooms
  6. True
  7. 1.2
  8. iron one shirt at a time
  9. 1 kilowatt-hour (kWh)
  10. wastes electricity
  11. 510
  12. 0.1
  13. True
  14. unplug idle chargers
  15. 2
  16. saves electricity
  17. saves electricity
  18. 3
  19. use LED lamps
  20. True
  21. wastes electricity
  22. 2
  23. False
  24. True
  25. wastes electricity
  26. leave fridge door open
  27. True
  28. 4
  29. 8
  30. use daylight to read
  31. saves electricity
  32. wastes electricity
  33. False
  34. iron one shirt at a time
  35. 150
  36. run fans in empty rooms
  37. saves electricity
  38. 1530
  39. 170
  40. leave fridge door open

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