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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 591 · 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 the TV on standby wastes electricity. (a) True (b) False
  2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  3. 3.🧾 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
  4. 4.True or false: to use LED lamps wastes electricity. (a) False (b) True
  5. 5.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
  7. 7.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) iron one shirt at a time
  8. 8.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  9. 9.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
  10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  12. 12.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  13. 13.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  14. 14.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  15. 15.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  16. 16.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
  18. 18.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  19. 19.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  20. 20.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) set the AC to 24 °C
  21. 21.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
  22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use daylight to read (d) set the AC to 24 °C
  23. 23.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
  24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  25. 25.True or false: to use daylight to read saves electricity. (a) False (b) True
  26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
  29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  30. 30.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  31. 31.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
  33. 33.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  34. 34.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) set the AC to 24 °C (d) close the fridge quickly
  35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
  37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
  38. 38.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  39. 39.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  40. 40.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True

Answer key

  1. True
  2. saves electricity
  3. an LED lamp
  4. False
  5. 1
  6. 1 kilowatt-hour (kWh)
  7. close the fridge quickly
  8. 1440
  9. use old filament bulbs
  10. wastes electricity
  11. saves electricity
  12. False
  13. False
  14. saves electricity
  15. 720
  16. False
  17. unplug idle chargers
  18. True
  19. 1.6
  20. set the AC to 24 °C
  21. use LED lamps
  22. leave fridge door open
  23. set the AC to 24 °C
  24. saves electricity
  25. True
  26. 357
  27. 770
  28. leave the TV on standby
  29. 1350
  30. False
  31. True
  32. use daylight to read
  33. 0.4
  34. iron one shirt at a time
  35. wastes electricity
  36. unplug idle chargers
  37. close the fridge quickly
  38. 200
  39. 2.5
  40. True

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