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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 367 · 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 family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  2. 2.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
  3. 3.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
  4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) set the AC to 24 °C
  5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) leave the TV on standby (d) run fans in empty rooms
  6. 6.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
  8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  10. 10.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
  11. 11.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
  13. 13.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  14. 14.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
  15. 15.True or false: to use LED lamps saves electricity. (a) False (b) True
  16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) leave the TV on standby
  17. 17.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  18. 18.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  19. 19.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  20. 20.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  21. 21.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  22. 22.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
  23. 23.True or false: to leave fridge door open saves electricity. (a) True (b) False
  24. 24.True or false: to use daylight to read saves electricity. (a) True (b) False
  25. 25.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
  29. 29.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
  30. 30.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  31. 31.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  33. 33.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  34. 34.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  35. 35.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  36. 36.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
  37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
  38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) unplug idle chargers
  39. 39.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  40. 40.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 320
  2. leave the TV on standby
  3. close the fridge quickly
  4. use old filament bulbs
  5. close the fridge quickly
  6. 1.5
  7. use LED lamps
  8. wastes electricity
  9. wastes electricity
  10. iron one shirt at a time
  11. False
  12. set the AC to 24 °C
  13. saves electricity
  14. an LED lamp
  15. True
  16. leave the TV on standby
  17. 910
  18. False
  19. False
  20. False
  21. False
  22. 1 kilowatt-hour (kWh)
  23. False
  24. True
  25. 0.1
  26. saves electricity
  27. saves electricity
  28. use LED lamps
  29. leave fridge door open
  30. 300
  31. 6
  32. 280
  33. 9
  34. saves electricity
  35. False
  36. unplug idle chargers
  37. set the AC to 24 °C
  38. use old filament bulbs
  39. 800
  40. 0.8

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