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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 854 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
  2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) close the fridge quickly
  3. 3.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) switch off empty rooms (d) unplug idle chargers
  4. 4.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  5. 5.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
  6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) use old filament bulbs
  7. 7.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  8. 8.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  9. 9.True or false: to use daylight to read saves electricity. (a) True (b) False
  10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) iron one shirt at a time
  11. 11.🧾 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?
  12. 12.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
  13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
  14. 14.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  15. 15.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  16. 16.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
  17. 17.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  18. 18.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  19. 19.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
  20. 20.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) use daylight to read (d) switch off empty rooms
  22. 22.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  23. 23.True or false: to use LED lamps saves electricity. (a) False (b) True
  24. 24.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
  26. 26.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
  27. 27.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  28. 28.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  29. 29.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  31. 31.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
  32. 32.🧾 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?
  33. 33.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
  35. 35.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  36. 36.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  37. 37.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  39. 39.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  40. 40.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers

Answer key

  1. 1 kilowatt-hour (kWh)
  2. close the fridge quickly
  3. run fans in empty rooms
  4. 520
  5. leave fridge door open
  6. use daylight to read
  7. 280
  8. 4
  9. True
  10. switch off empty rooms
  11. 595
  12. an LED lamp
  13. leave the TV on standby
  14. 255
  15. True
  16. set the AC to 24 °C
  17. 100
  18. 750
  19. use LED lamps
  20. 8
  21. use old filament bulbs
  22. False
  23. True
  24. 360
  25. switch off empty rooms
  26. iron one shirt at a time
  27. 0.2
  28. False
  29. 0.5
  30. wastes electricity
  31. close the fridge quickly
  32. 238
  33. False
  34. unplug idle chargers
  35. 1280
  36. False
  37. 3
  38. saves electricity
  39. saves electricity
  40. leave the TV on standby

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