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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 25 · 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) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
  2. 2.🧾 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?
  3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
  4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  5. 5.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  6. 6.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  8. 8.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  9. 9.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) set the AC to 24 °C (d) use old filament bulbs
  10. 10.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
  11. 11.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  13. 13.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  14. 14.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
  15. 15.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  16. 16.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  17. 17.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
  18. 18.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
  20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
  23. 23.🧾 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
  24. 24.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  25. 25.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  26. 26.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) leave fridge door open
  28. 28.True or false: to use LED lamps wastes electricity. (a) False (b) True
  29. 29.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
  31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  32. 32.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  33. 33.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
  34. 34.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  35. 35.🧾 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?
  36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  37. 37.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  38. 38.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
  39. 39.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  40. 40.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open

Answer key

  1. close the fridge quickly
  2. 51
  3. iron one shirt at a time
  4. saves electricity
  5. True
  6. 160
  7. 238
  8. False
  9. set the AC to 24 °C
  10. use LED lamps
  11. True
  12. 1 kilowatt-hour (kWh)
  13. False
  14. run fans in empty rooms
  15. saves electricity
  16. 1120
  17. set the AC to 24 °C
  18. 1.2
  19. switch off empty rooms
  20. saves electricity
  21. wastes electricity
  22. run fans in empty rooms
  23. an LED lamp
  24. 5
  25. 1.25
  26. 2.5
  27. leave fridge door open
  28. False
  29. 0.1
  30. leave the TV on standby
  31. saves electricity
  32. 1260
  33. iron one shirt at a time
  34. True
  35. 68
  36. wastes electricity
  37. saves electricity
  38. switch off empty rooms
  39. False
  40. use daylight to read

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