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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 623 · 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 of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
  2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) run fans in empty rooms (d) unplug idle chargers
  3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) use old filament bulbs
  5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
  6. 6.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
  7. 7.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  8. 8.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  9. 9.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) set the AC to 24 °C (d) iron one shirt at a time
  10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
  11. 11.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  12. 12.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  13. 13.True or false: to use LED lamps saves electricity. (a) True (b) False
  14. 14.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  16. 16.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  17. 17.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  18. 18.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  21. 21.True or false: to use LED lamps wastes electricity. (a) False (b) True
  22. 22.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
  23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  24. 24.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
  25. 25.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
  26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  27. 27.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
  29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
  30. 30.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  31. 31.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 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?
  33. 33.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  35. 35.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  38. 38.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  39. 39.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  40. 40.True or false: to use old filament bulbs wastes electricity. (a) False (b) True

Answer key

  1. close the fridge quickly
  2. run fans in empty rooms
  3. wastes electricity
  4. use old filament bulbs
  5. an LED lamp
  6. unplug idle chargers
  7. False
  8. saves electricity
  9. iron one shirt at a time
  10. 1 kilowatt-hour (kWh)
  11. 640
  12. 320
  13. True
  14. 3
  15. 720
  16. saves electricity
  17. True
  18. 0.25
  19. 2
  20. saves electricity
  21. False
  22. leave fridge door open
  23. wastes electricity
  24. leave the TV on standby
  25. run fans in empty rooms
  26. 340
  27. False
  28. close the fridge quickly
  29. leave fridge door open
  30. 160
  31. 6
  32. 765
  33. 900
  34. wastes electricity
  35. 16
  36. 1
  37. 189
  38. True
  39. 0.4
  40. True

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