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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 57 · 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 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
  2. 2.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  3. 3.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) leave fridge door open
  4. 4.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) run fans in empty rooms
  6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
  7. 7.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
  9. 9.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  10. 10.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  11. 11.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
  12. 12.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  13. 13.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  14. 14.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
  15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
  16. 16.🧾 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?
  17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  19. 19.True or false: to use daylight to read wastes electricity. (a) False (b) True
  20. 20.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  21. 21.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  23. 23.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  24. 24.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  25. 25.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
  26. 26.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  27. 27.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
  29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  30. 30.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  31. 31.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
  32. 32.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
  33. 33.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
  36. 36.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  37. 37.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  39. 39.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
  40. 40.True or false: to use LED lamps saves electricity. (a) False (b) True

Answer key

  1. 1 kilowatt-hour (kWh)
  2. 2
  3. leave fridge door open
  4. False
  5. run fans in empty rooms
  6. leave the TV on standby
  7. 1600
  8. leave the TV on standby
  9. True
  10. 450
  11. use old filament bulbs
  12. 680
  13. 880
  14. use daylight to read
  15. switch off empty rooms
  16. 425
  17. 765
  18. saves electricity
  19. False
  20. 400
  21. 630
  22. 102
  23. 1
  24. 0.2
  25. use LED lamps
  26. 1.5
  27. 0.5
  28. switch off empty rooms
  29. wastes electricity
  30. 16
  31. iron one shirt at a time
  32. an LED lamp
  33. 360
  34. wastes electricity
  35. set the AC to 24 °C
  36. False
  37. 2
  38. 8
  39. close the fridge quickly
  40. True

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