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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 538 · 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 wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
  2. 2.True or false: to use LED lamps wastes electricity. (a) False (b) True
  3. 3.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  5. 5.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  6. 6.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  7. 7.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  8. 8.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
  9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
  10. 10.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  12. 12.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
  13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  14. 14.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  15. 15.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
  16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  17. 17.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  18. 18.🧾 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
  19. 19.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
  20. 20.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  21. 21.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
  22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  24. 24.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) run fans in empty rooms (d) switch off empty rooms
  26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  28. 28.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  29. 29.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  31. 31.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
  32. 32.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
  33. 33.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  34. 34.True or false: to use LED lamps saves electricity. (a) True (b) False
  35. 35.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  37. 37.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  38. 38.True or false: to leave fridge door open saves electricity. (a) False (b) True
  39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) use LED lamps
  40. 40.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. run fans in empty rooms
  2. False
  3. 150
  4. 680
  5. 12
  6. True
  7. 980
  8. use old filament bulbs
  9. unplug idle chargers
  10. saves electricity
  11. 425
  12. iron one shirt at a time
  13. 340
  14. 2.5
  15. unplug idle chargers
  16. saves electricity
  17. True
  18. an LED lamp
  19. set the AC to 24 °C
  20. 900
  21. close the fridge quickly
  22. saves electricity
  23. wastes electricity
  24. 0.5
  25. run fans in empty rooms
  26. wastes electricity
  27. 1120
  28. 9
  29. wastes electricity
  30. 136
  31. switch off empty rooms
  32. use LED lamps
  33. 4
  34. True
  35. 1400
  36. wastes electricity
  37. True
  38. False
  39. use old filament bulbs
  40. 0.2

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