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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 59 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
  2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
  3. 3.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) use old filament bulbs
  5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
  7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) leave fridge door open
  8. 8.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  9. 9.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  10. 10.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  12. 12.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  13. 13.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
  14. 14.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
  18. 18.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
  19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
  21. 21.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  22. 22.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
  24. 24.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  25. 25.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  26. 26.True or false: to use LED lamps wastes electricity. (a) False (b) True
  27. 27.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  28. 28.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
  32. 32.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
  33. 33.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  34. 34.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  36. 36.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  37. 37.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
  38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  39. 39.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
  40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) use daylight to read

Answer key

  1. 1 kilowatt-hour (kWh)
  2. switch off empty rooms
  3. True
  4. use old filament bulbs
  5. wastes electricity
  6. use daylight to read
  7. leave fridge door open
  8. True
  9. True
  10. True
  11. saves electricity
  12. 480
  13. run fans in empty rooms
  14. 0.1
  15. 250
  16. False
  17. leave the TV on standby
  18. close the fridge quickly
  19. saves electricity
  20. use LED lamps
  21. 840
  22. saves electricity
  23. unplug idle chargers
  24. 0.5
  25. False
  26. False
  27. wastes electricity
  28. 300
  29. wastes electricity
  30. wastes electricity
  31. unplug idle chargers
  32. switch off empty rooms
  33. True
  34. 3
  35. saves electricity
  36. 10
  37. use daylight to read
  38. 204
  39. an LED lamp
  40. iron one shirt at a time

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