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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 652 · 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 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  2. 2.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  3. 3.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use LED lamps (d) set the AC to 24 °C
  4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
  5. 5.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) close the fridge quickly
  7. 7.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  8. 8.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
  10. 10.True or false: to use LED lamps wastes electricity. (a) True (b) False
  11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  12. 12.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  13. 13.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  16. 16.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) use daylight to read
  17. 17.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  18. 18.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
  19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
  20. 20.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  21. 21.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  22. 22.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
  23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) use LED lamps
  24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
  26. 26.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) use LED lamps
  28. 28.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  29. 29.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
  30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
  31. 31.True or false: to use LED lamps saves electricity. (a) True (b) False
  32. 32.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  33. 33.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  34. 34.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  36. 36.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  37. 37.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
  38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  39. 39.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
  40. 40.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 1
  2. True
  3. run fans in empty rooms
  4. 1 kilowatt-hour (kWh)
  5. 1
  6. iron one shirt at a time
  7. 8
  8. 8
  9. use old filament bulbs
  10. False
  11. saves electricity
  12. True
  13. True
  14. wastes electricity
  15. saves electricity
  16. leave the TV on standby
  17. 3
  18. run fans in empty rooms
  19. use old filament bulbs
  20. True
  21. 1260
  22. an LED lamp
  23. leave fridge door open
  24. 63
  25. switch off empty rooms
  26. 400
  27. iron one shirt at a time
  28. False
  29. close the fridge quickly
  30. unplug idle chargers
  31. True
  32. False
  33. 2.5
  34. 1.2
  35. 480
  36. 4
  37. use daylight to read
  38. 204
  39. leave the TV on standby
  40. 0.6

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