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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 774 · 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 leave fridge door open saves electricity. (a) True (b) False
  2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
  3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  5. 5.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
  6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
  8. 8.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  9. 9.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  10. 10.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
  11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
  12. 12.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) close the fridge quickly (d) use daylight to read
  13. 13.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  15. 15.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  16. 16.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  18. 18.True or false: to use daylight to read saves electricity. (a) True (b) False
  19. 19.🔍 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
  20. 20.🔍 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
  21. 21.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
  24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  25. 25.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  26. 26.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  27. 27.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
  28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
  31. 31.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  32. 32.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  33. 33.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
  34. 34.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  35. 35.True or false: to use LED lamps saves electricity. (a) False (b) True
  36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
  37. 37.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
  38. 38.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  39. 39.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) use old filament bulbs
  40. 40.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True

Answer key

  1. False
  2. close the fridge quickly
  3. saves electricity
  4. saves electricity
  5. leave the TV on standby
  6. saves electricity
  7. 1 kilowatt-hour (kWh)
  8. 240
  9. True
  10. use LED lamps
  11. use daylight to read
  12. use old filament bulbs
  13. 0.8
  14. 102
  15. False
  16. True
  17. 459
  18. True
  19. iron one shirt at a time
  20. run fans in empty rooms
  21. False
  22. 252
  23. set the AC to 24 °C
  24. 204
  25. False
  26. 2.5
  27. an LED lamp
  28. saves electricity
  29. 650
  30. use LED lamps
  31. 0.25
  32. True
  33. iron one shirt at a time
  34. 6
  35. True
  36. run fans in empty rooms
  37. leave the TV on standby
  38. 6
  39. switch off empty rooms
  40. True

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