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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 863 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  2. 2.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
  3. 3.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
  4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) switch off empty rooms (d) unplug idle chargers
  6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  7. 7.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
  8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  11. 11.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
  12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  13. 13.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
  14. 14.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
  15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
  16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
  17. 17.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  18. 18.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  20. 20.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  21. 21.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
  22. 22.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  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 9 hours. How many watt-hours (Wh) are saved?
  25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) use daylight to read
  28. 28.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  29. 29.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  30. 30.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  31. 31.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  33. 33.True or false: to leave fridge door open saves electricity. (a) False (b) True
  34. 34.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  35. 35.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
  36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
  37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) use daylight to read (d) close the fridge quickly
  38. 38.True or false: to use LED lamps saves electricity. (a) False (b) True
  39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity

Answer key

  1. wastes electricity
  2. use old filament bulbs
  3. an LED lamp
  4. wastes electricity
  5. run fans in empty rooms
  6. saves electricity
  7. use daylight to read
  8. saves electricity
  9. wastes electricity
  10. wastes electricity
  11. run fans in empty rooms
  12. 140
  13. use LED lamps
  14. set the AC to 24 °C
  15. unplug idle chargers
  16. iron one shirt at a time
  17. 1.6
  18. 0.8
  19. 550
  20. 1.5
  21. 1 kilowatt-hour (kWh)
  22. True
  23. saves electricity
  24. 567
  25. 315
  26. 504
  27. leave fridge door open
  28. True
  29. 4
  30. True
  31. 6
  32. 350
  33. False
  34. False
  35. switch off empty rooms
  36. use daylight to read
  37. use old filament bulbs
  38. True
  39. 1330
  40. saves electricity

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