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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 875 · 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 close the fridge quickly wastes electricity. (a) False (b) True
  2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  3. 3.True or false: to leave fridge door open saves electricity. (a) True (b) False
  4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
  7. 7.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) use LED lamps
  8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
  9. 9.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  10. 10.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
  11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
  12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  13. 13.True or false: to use LED lamps wastes electricity. (a) False (b) True
  14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
  15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  17. 17.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  18. 18.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  19. 19.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  22. 22.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) run fans in empty rooms
  24. 24.🧾 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?
  25. 25.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) leave the TV on standby
  28. 28.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
  29. 29.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
  31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  32. 32.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  34. 34.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  35. 35.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
  36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  38. 38.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  39. 39.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  40. 40.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. False
  2. wastes electricity
  3. False
  4. saves electricity
  5. wastes electricity
  6. set the AC to 24 °C
  7. leave fridge door open
  8. 1 kilowatt-hour (kWh)
  9. 660
  10. use daylight to read
  11. iron one shirt at a time
  12. saves electricity
  13. False
  14. an LED lamp
  15. 63
  16. 272
  17. True
  18. False
  19. False
  20. 102
  21. saves electricity
  22. 10
  23. use daylight to read
  24. 170
  25. True
  26. 238
  27. set the AC to 24 °C
  28. close the fridge quickly
  29. True
  30. use LED lamps
  31. saves electricity
  32. 0.6
  33. 1050
  34. 350
  35. switch off empty rooms
  36. 180
  37. wastes electricity
  38. 5
  39. wastes electricity
  40. 20

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