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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 447 · 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) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
  2. 2.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 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?
  4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
  5. 5.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
  6. 6.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  7. 7.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  10. 10.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  11. 11.True or false: to use LED lamps saves electricity. (a) True (b) False
  12. 12.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
  13. 13.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
  14. 14.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use daylight to read (d) use LED lamps
  15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
  16. 16.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  17. 17.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  18. 18.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use old filament bulbs
  20. 20.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
  21. 21.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
  24. 24.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) use old filament bulbs
  25. 25.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  26. 26.True or false: to use LED lamps wastes electricity. (a) False (b) True
  27. 27.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  28. 28.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
  30. 30.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  31. 31.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  33. 33.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  34. 34.🧾 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?
  35. 35.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  36. 36.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) switch off empty rooms (d) set the AC to 24 °C
  37. 37.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  38. 38.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  39. 39.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
  40. 40.🧾 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?

Answer key

  1. use daylight to read
  2. 4
  3. 34
  4. leave fridge door open
  5. an LED lamp
  6. 0.3
  7. saves electricity
  8. wastes electricity
  9. wastes electricity
  10. True
  11. True
  12. close the fridge quickly
  13. use LED lamps
  14. leave fridge door open
  15. iron one shirt at a time
  16. False
  17. 2
  18. False
  19. set the AC to 24 °C
  20. use LED lamps
  21. 9
  22. 1 kilowatt-hour (kWh)
  23. set the AC to 24 °C
  24. use old filament bulbs
  25. 280
  26. False
  27. True
  28. False
  29. unplug idle chargers
  30. saves electricity
  31. 0.2
  32. 0.6
  33. False
  34. 238
  35. 680
  36. iron one shirt at a time
  37. False
  38. False
  39. use old filament bulbs
  40. 255

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