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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 803 · 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) run fans in empty rooms (d) switch off empty rooms
  2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  3. 3.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
  4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) run fans in empty rooms
  5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
  7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
  8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
  9. 9.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
  11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
  13. 13.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  15. 15.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
  16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  17. 17.True or false: to use LED lamps wastes electricity. (a) True (b) False
  18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  19. 19.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  21. 21.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  22. 22.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  23. 23.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use daylight to read (d) unplug idle chargers
  26. 26.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  27. 27.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read
  28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  29. 29.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  30. 30.True or false: to use LED lamps saves electricity. (a) False (b) True
  31. 31.🧾 A 100 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 wastes electricity. (a) False (b) True
  33. 33.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  35. 35.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  36. 36.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  37. 37.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  38. 38.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  39. 39.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
  40. 40.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. switch off empty rooms
  2. wastes electricity
  3. iron one shirt at a time
  4. run fans in empty rooms
  5. an LED lamp
  6. 1 kilowatt-hour (kWh)
  7. switch off empty rooms
  8. use old filament bulbs
  9. False
  10. leave the TV on standby
  11. saves electricity
  12. leave fridge door open
  13. 0.8
  14. saves electricity
  15. close the fridge quickly
  16. saves electricity
  17. False
  18. 272
  19. 0.3
  20. 126
  21. 80
  22. True
  23. 720
  24. wastes electricity
  25. iron one shirt at a time
  26. 2
  27. use old filament bulbs
  28. 1200
  29. 0.5
  30. True
  31. 0.2
  32. False
  33. 510
  34. wastes electricity
  35. 4
  36. False
  37. True
  38. True
  39. leave the TV on standby
  40. 12

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