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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 226 · 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.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  2. 2.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
  4. 4.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  5. 5.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
  6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
  7. 7.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) switch off empty rooms
  8. 8.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  10. 10.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
  12. 12.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
  16. 16.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  17. 17.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
  20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  21. 21.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  22. 22.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
  23. 23.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
  26. 26.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  27. 27.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  28. 28.🧾 A family uses 30 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 LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
  30. 30.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
  32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
  34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  35. 35.True or false: to use daylight to read wastes electricity. (a) False (b) True
  36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) switch off empty rooms (d) set the AC to 24 °C
  37. 37.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
  38. 38.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  39. 39.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  40. 40.True or false: to leave fridge door open wastes electricity. (a) True (b) False

Answer key

  1. 400
  2. 360
  3. 1 kilowatt-hour (kWh)
  4. 1
  5. use LED lamps
  6. leave the TV on standby
  7. leave fridge door open
  8. 3
  9. wastes electricity
  10. 2.5
  11. leave fridge door open
  12. 250
  13. 459
  14. 153
  15. an LED lamp
  16. 0.5
  17. 1.6
  18. 252
  19. use old filament bulbs
  20. wastes electricity
  21. saves electricity
  22. switch off empty rooms
  23. 6
  24. 255
  25. set the AC to 24 °C
  26. 2
  27. 1.5
  28. 210
  29. run fans in empty rooms
  30. 400
  31. use daylight to read
  32. 170
  33. close the fridge quickly
  34. 102
  35. False
  36. use old filament bulbs
  37. switch off empty rooms
  38. True
  39. False
  40. True

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