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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 28 · 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 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  2. 2.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
  3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  4. 4.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  5. 5.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  6. 6.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  8. 8.🧾 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
  9. 9.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  11. 11.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  14. 14.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  15. 15.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
  17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
  19. 19.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  20. 20.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
  22. 22.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
  24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  25. 25.🧾 A 1000 W appliance runs for 8 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) wastes electricity (b) saves electricity
  27. 27.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
  28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
  29. 29.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  30. 30.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  31. 31.🧾 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?
  32. 32.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  34. 34.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  35. 35.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  37. 37.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
  38. 38.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  39. 39.True or false: to use LED lamps saves electricity. (a) False (b) True
  40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?

Answer key

  1. 600
  2. iron one shirt at a time
  3. saves electricity
  4. 0.4
  5. 720
  6. 600
  7. 160
  8. an LED lamp
  9. True
  10. 1 kilowatt-hour (kWh)
  11. 0.4
  12. wastes electricity
  13. 765
  14. saves electricity
  15. 250
  16. use daylight to read
  17. saves electricity
  18. run fans in empty rooms
  19. 350
  20. 2
  21. iron one shirt at a time
  22. wastes electricity
  23. switch off empty rooms
  24. saves electricity
  25. 8
  26. wastes electricity
  27. leave the TV on standby
  28. set the AC to 24 °C
  29. 960
  30. True
  31. 170
  32. 20
  33. saves electricity
  34. False
  35. False
  36. 880
  37. run fans in empty rooms
  38. 5
  39. True
  40. 315

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