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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 821 · 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) unplug idle chargers (b) iron one shirt at a time (c) close the fridge quickly (d) use LED lamps
  2. 2.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  4. 4.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  5. 5.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  6. 6.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  7. 7.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
  8. 8.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) close the fridge quickly (d) switch off empty rooms
  9. 9.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
  10. 10.🧾 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?
  11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  12. 12.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  15. 15.🧾 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?
  16. 16.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  17. 17.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
  18. 18.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
  20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use daylight to read (d) set the AC to 24 °C
  22. 22.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  23. 23.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  25. 25.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  26. 26.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  27. 27.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  28. 28.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  29. 29.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  31. 31.True or false: to use LED lamps saves electricity. (a) True (b) False
  32. 32.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  33. 33.True or false: to use LED lamps wastes electricity. (a) True (b) False
  34. 34.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  35. 35.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) close the fridge quickly
  36. 36.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  39. 39.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

Answer key

  1. iron one shirt at a time
  2. True
  3. 1 kilowatt-hour (kWh)
  4. 0.3
  5. True
  6. False
  7. an LED lamp
  8. use old filament bulbs
  9. close the fridge quickly
  10. 238
  11. 340
  12. 0.25
  13. wastes electricity
  14. wastes electricity
  15. 102
  16. False
  17. run fans in empty rooms
  18. 1440
  19. unplug idle chargers
  20. wastes electricity
  21. run fans in empty rooms
  22. 5
  23. 700
  24. saves electricity
  25. 630
  26. saves electricity
  27. 520
  28. True
  29. True
  30. 51
  31. True
  32. True
  33. False
  34. True
  35. leave fridge door open
  36. 80
  37. saves electricity
  38. saves electricity
  39. 420
  40. 490

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