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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 261 · 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.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  4. 4.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) use daylight to read (d) switch off empty rooms
  6. 6.🧾 A family uses 20 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) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
  8. 8.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
  9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
  10. 10.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
  11. 11.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
  13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
  14. 14.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
  15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
  16. 16.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  17. 17.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  18. 18.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
  19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  20. 20.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
  21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  22. 22.🔍 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
  23. 23.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  25. 25.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  29. 29.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  30. 30.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  31. 31.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  32. 32.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  33. 33.True or false: to use LED lamps saves electricity. (a) True (b) False
  34. 34.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
  35. 35.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  36. 36.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  37. 37.True or false: to use LED lamps wastes electricity. (a) False (b) True
  38. 38.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  39. 39.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  40. 40.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

Answer key

  1. False
  2. 170
  3. saves electricity
  4. 2
  5. use old filament bulbs
  6. 80
  7. switch off empty rooms
  8. run fans in empty rooms
  9. leave fridge door open
  10. set the AC to 24 °C
  11. 1 kilowatt-hour (kWh)
  12. iron one shirt at a time
  13. use daylight to read
  14. use daylight to read
  15. run fans in empty rooms
  16. True
  17. wastes electricity
  18. leave fridge door open
  19. saves electricity
  20. an LED lamp
  21. wastes electricity
  22. unplug idle chargers
  23. 6
  24. 63
  25. 1.5
  26. wastes electricity
  27. saves electricity
  28. wastes electricity
  29. False
  30. 4
  31. 3
  32. True
  33. True
  34. use old filament bulbs
  35. saves electricity
  36. 1600
  37. False
  38. 0.1
  39. True
  40. 720

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