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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 240 · 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.🧾 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?
  2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  4. 4.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
  5. 5.True or false: to use daylight to read saves electricity. (a) True (b) False
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
  7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
  9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers
  10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
  11. 11.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) use daylight to read
  12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
  13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  14. 14.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  15. 15.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) set the AC to 24 °C
  17. 17.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  18. 18.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) switch off empty rooms (d) use LED lamps
  20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
  22. 22.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
  23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  25. 25.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  26. 26.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  27. 27.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
  28. 28.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
  31. 31.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  32. 32.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  34. 34.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  35. 35.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  36. 36.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  38. 38.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  39. 39.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time

Answer key

  1. 51
  2. wastes electricity
  3. saves electricity
  4. switch off empty rooms
  5. True
  6. 1 kilowatt-hour (kWh)
  7. 255
  8. an LED lamp
  9. leave fridge door open
  10. set the AC to 24 °C
  11. use daylight to read
  12. use LED lamps
  13. 200
  14. 480
  15. True
  16. set the AC to 24 °C
  17. False
  18. 320
  19. leave the TV on standby
  20. saves electricity
  21. close the fridge quickly
  22. use daylight to read
  23. saves electricity
  24. saves electricity
  25. False
  26. 10
  27. leave fridge door open
  28. 1260
  29. 900
  30. use LED lamps
  31. saves electricity
  32. 7.5
  33. 6
  34. True
  35. wastes electricity
  36. 0.4
  37. 34
  38. 300
  39. 1040
  40. iron one shirt at a time

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