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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 605 · 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 is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
  2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) use old filament bulbs
  3. 3.🧾 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
  4. 4.🧾 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?
  5. 5.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  6. 6.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) unplug idle chargers (d) set the AC to 24 °C
  8. 8.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  11. 11.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  12. 12.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  13. 13.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
  15. 15.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  18. 18.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  19. 19.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  21. 21.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
  22. 22.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  24. 24.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  25. 25.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  26. 26.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  27. 27.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  28. 28.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
  29. 29.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  30. 30.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
  31. 31.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
  32. 32.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
  33. 33.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
  34. 34.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
  37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  38. 38.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  39. 39.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

Answer key

  1. leave fridge door open
  2. switch off empty rooms
  3. an LED lamp
  4. 567
  5. 760
  6. 240
  7. use old filament bulbs
  8. 441
  9. wastes electricity
  10. wastes electricity
  11. 1
  12. True
  13. 6
  14. set the AC to 24 °C
  15. 980
  16. saves electricity
  17. saves electricity
  18. False
  19. 16
  20. 1350
  21. leave the TV on standby
  22. 650
  23. saves electricity
  24. True
  25. saves electricity
  26. True
  27. 0.8
  28. close the fridge quickly
  29. 1190
  30. use daylight to read
  31. set the AC to 24 °C
  32. 1 kilowatt-hour (kWh)
  33. use LED lamps
  34. 0.8
  35. 1440
  36. run fans in empty rooms
  37. 420
  38. 1080
  39. True
  40. 200

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