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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 897 · 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) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
  2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
  3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  4. 4.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) close the fridge quickly (d) switch off empty rooms
  6. 6.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
  8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  9. 9.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
  10. 10.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  11. 11.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
  13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  14. 14.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly
  15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
  16. 16.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  18. 18.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
  19. 19.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  20. 20.🧾 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?
  21. 21.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  22. 22.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
  24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
  27. 27.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  28. 28.True or false: to use LED lamps saves electricity. (a) False (b) True
  29. 29.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  30. 30.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
  32. 32.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  34. 34.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  36. 36.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  37. 37.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  38. 38.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  40. 40.True or false: to switch off empty rooms wastes electricity. (a) True (b) False

Answer key

  1. iron one shirt at a time
  2. set the AC to 24 °C
  3. wastes electricity
  4. True
  5. use old filament bulbs
  6. switch off empty rooms
  7. 1 kilowatt-hour (kWh)
  8. wastes electricity
  9. leave fridge door open
  10. False
  11. True
  12. leave the TV on standby
  13. wastes electricity
  14. close the fridge quickly
  15. iron one shirt at a time
  16. 306
  17. wastes electricity
  18. an LED lamp
  19. saves electricity
  20. 315
  21. 1260
  22. False
  23. leave fridge door open
  24. saves electricity
  25. saves electricity
  26. set the AC to 24 °C
  27. 720
  28. True
  29. 640
  30. 5
  31. use LED lamps
  32. False
  33. 300
  34. 2
  35. 2.5
  36. True
  37. wastes electricity
  38. 650
  39. 425
  40. False

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