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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 449 · 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 is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
  2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
  3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  4. 4.True or false: to leave fridge door open saves electricity. (a) False (b) True
  5. 5.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  6. 6.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
  7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  8. 8.🧾 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?
  9. 9.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
  10. 10.True or false: to use LED lamps saves electricity. (a) True (b) False
  11. 11.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
  14. 14.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  15. 15.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) set the AC to 24 °C (d) use daylight to read
  16. 16.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) set the AC to 24 °C (d) switch off empty rooms
  17. 17.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  18. 18.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
  19. 19.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  21. 21.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  23. 23.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  24. 24.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  25. 25.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  27. 27.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) run fans in empty rooms
  30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
  31. 31.🔍 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
  32. 32.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  33. 33.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
  34. 34.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  35. 35.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
  38. 38.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
  39. 39.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  40. 40.True or false: to use old filament bulbs wastes electricity. (a) False (b) True

Answer key

  1. leave the TV on standby
  2. 1 kilowatt-hour (kWh)
  3. 102
  4. False
  5. wastes electricity
  6. iron one shirt at a time
  7. wastes electricity
  8. 63
  9. switch off empty rooms
  10. True
  11. 1200
  12. saves electricity
  13. close the fridge quickly
  14. 600
  15. iron one shirt at a time
  16. leave the TV on standby
  17. False
  18. an LED lamp
  19. 8
  20. 255
  21. 0.5
  22. 20
  23. 12
  24. False
  25. 1440
  26. 378
  27. 15
  28. 630
  29. use daylight to read
  30. leave fridge door open
  31. switch off empty rooms
  32. 720
  33. use daylight to read
  34. saves electricity
  35. 1
  36. 2.5
  37. run fans in empty rooms
  38. close the fridge quickly
  39. 9
  40. True

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