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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 542 · 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.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
  2. 2.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  3. 3.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  4. 4.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
  6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
  8. 8.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
  10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
  11. 11.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  12. 12.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  13. 13.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  14. 14.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
  16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave fridge door open
  17. 17.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
  19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) close the fridge quickly
  20. 20.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
  21. 21.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
  22. 22.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  23. 23.🧾 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?
  24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  29. 29.🧾 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?
  30. 30.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  31. 31.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
  33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
  34. 34.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  35. 35.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  36. 36.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
  37. 37.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity

Answer key

  1. use old filament bulbs
  2. saves electricity
  3. 3
  4. True
  5. iron one shirt at a time
  6. saves electricity
  7. leave the TV on standby
  8. 320
  9. switch off empty rooms
  10. an LED lamp
  11. 900
  12. False
  13. True
  14. True
  15. use old filament bulbs
  16. close the fridge quickly
  17. 0.25
  18. leave fridge door open
  19. iron one shirt at a time
  20. 1 kilowatt-hour (kWh)
  21. use LED lamps
  22. 270
  23. 102
  24. 306
  25. 170
  26. wastes electricity
  27. 8
  28. wastes electricity
  29. 252
  30. 0.1
  31. 150
  32. switch off empty rooms
  33. close the fridge quickly
  34. False
  35. 0.2
  36. use LED lamps
  37. 2
  38. saves electricity
  39. False
  40. wastes electricity

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