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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 466 · 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) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
  2. 2.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  3. 3.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  4. 4.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
  5. 5.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
  6. 6.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  7. 7.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  9. 9.True or false: to use daylight to read wastes electricity. (a) False (b) True
  10. 10.True or false: to use LED lamps wastes electricity. (a) False (b) True
  11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
  12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  13. 13.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
  15. 15.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  17. 17.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  18. 18.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  19. 19.🧾 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?
  20. 20.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
  21. 21.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) use old filament bulbs
  22. 22.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) run fans in empty rooms
  23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  24. 24.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) set the AC to 24 °C (d) use LED lamps
  25. 25.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  26. 26.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  28. 28.True or false: to leave fridge door open saves electricity. (a) False (b) True
  29. 29.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  30. 30.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  31. 31.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
  32. 32.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
  34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) use daylight to read
  35. 35.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  36. 36.True or false: to use daylight to read saves electricity. (a) False (b) True
  37. 37.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  38. 38.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) run fans in empty rooms (d) unplug idle chargers
  40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms

Answer key

  1. use LED lamps
  2. False
  3. False
  4. leave the TV on standby
  5. leave fridge door open
  6. False
  7. 0.1
  8. saves electricity
  9. False
  10. False
  11. an LED lamp
  12. wastes electricity
  13. True
  14. switch off empty rooms
  15. 0.2
  16. wastes electricity
  17. 2
  18. saves electricity
  19. 765
  20. use daylight to read
  21. set the AC to 24 °C
  22. unplug idle chargers
  23. 770
  24. iron one shirt at a time
  25. True
  26. 3
  27. saves electricity
  28. False
  29. True
  30. True
  31. 1 kilowatt-hour (kWh)
  32. saves electricity
  33. use daylight to read
  34. iron one shirt at a time
  35. 12
  36. True
  37. False
  38. 1140
  39. run fans in empty rooms
  40. run fans in empty rooms

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