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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 755 · 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 is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
  2. 2.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  3. 3.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  4. 4.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  5. 5.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
  6. 6.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
  7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) set the AC to 24 °C
  8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
  9. 9.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
  10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
  14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  15. 15.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  16. 16.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  17. 17.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
  18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  19. 19.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  22. 22.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
  23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) iron one shirt at a time
  24. 24.True or false: to use daylight to read wastes electricity. (a) True (b) False
  25. 25.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  26. 26.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  27. 27.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  28. 28.True or false: to use LED lamps wastes electricity. (a) True (b) False
  29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  30. 30.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  31. 31.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) switch off empty rooms
  32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  33. 33.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
  34. 34.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  35. 35.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  36. 36.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  37. 37.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

Answer key

  1. use daylight to read
  2. False
  3. True
  4. 0.25
  5. an LED lamp
  6. use daylight to read
  7. iron one shirt at a time
  8. leave fridge door open
  9. run fans in empty rooms
  10. wastes electricity
  11. wastes electricity
  12. wastes electricity
  13. close the fridge quickly
  14. 315
  15. 600
  16. True
  17. 1 kilowatt-hour (kWh)
  18. saves electricity
  19. wastes electricity
  20. wastes electricity
  21. saves electricity
  22. set the AC to 24 °C
  23. iron one shirt at a time
  24. False
  25. True
  26. False
  27. False
  28. False
  29. 595
  30. True
  31. leave fridge door open
  32. saves electricity
  33. run fans in empty rooms
  34. 0.6
  35. True
  36. 300
  37. 7.5
  38. 1260
  39. saves electricity
  40. 630

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