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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 486 · 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 run fans in empty rooms? (a) wastes electricity (b) saves electricity
  2. 2.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) iron one shirt at a time (d) close the fridge quickly
  3. 3.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) use daylight to read
  4. 4.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  5. 5.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
  6. 6.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  7. 7.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  8. 8.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) use daylight to read
  10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  11. 11.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) use LED lamps
  12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
  13. 13.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
  14. 14.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
  16. 16.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  17. 17.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  18. 18.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  19. 19.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
  20. 20.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  22. 22.True or false: to use daylight to read wastes electricity. (a) False (b) True
  23. 23.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
  27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  28. 28.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  30. 30.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  31. 31.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  32. 32.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  34. 34.True or false: to use LED lamps wastes electricity. (a) False (b) True
  35. 35.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  36. 36.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
  37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  38. 38.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  39. 39.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
  40. 40.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. wastes electricity
  2. iron one shirt at a time
  3. leave fridge door open
  4. 760
  5. 1 kilowatt-hour (kWh)
  6. 640
  7. 700
  8. True
  9. use old filament bulbs
  10. 68
  11. iron one shirt at a time
  12. leave the TV on standby
  13. an LED lamp
  14. False
  15. leave the TV on standby
  16. False
  17. False
  18. saves electricity
  19. close the fridge quickly
  20. False
  21. saves electricity
  22. False
  23. 0.5
  24. 102
  25. 51
  26. use old filament bulbs
  27. 153
  28. 0.6
  29. wastes electricity
  30. 1.2
  31. False
  32. 15
  33. wastes electricity
  34. False
  35. saves electricity
  36. use LED lamps
  37. wastes electricity
  38. True
  39. switch off empty rooms
  40. 4

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