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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 385 · 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 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  2. 2.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  3. 3.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  4. 4.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  5. 5.🧾 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?
  6. 6.🧾 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
  7. 7.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) switch off empty rooms
  8. 8.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
  9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  10. 10.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  11. 11.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
  12. 12.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  13. 13.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
  14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) use old filament bulbs
  15. 15.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers
  16. 16.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  17. 17.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  18. 18.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) use old filament bulbs
  21. 21.🧾 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?
  22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  23. 23.True or false: to use daylight to read saves electricity. (a) False (b) True
  24. 24.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  26. 26.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  28. 28.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  30. 30.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  31. 31.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  34. 34.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  35. 35.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  36. 36.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
  37. 37.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  38. 38.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  39. 39.🧾 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?
  40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open

Answer key

  1. 2
  2. 630
  3. 2
  4. 960
  5. 102
  6. an LED lamp
  7. use old filament bulbs
  8. use LED lamps
  9. 51
  10. saves electricity
  11. close the fridge quickly
  12. 4
  13. 1 kilowatt-hour (kWh)
  14. switch off empty rooms
  15. run fans in empty rooms
  16. 160
  17. 0.5
  18. 0.2
  19. 0.6
  20. set the AC to 24 °C
  21. 170
  22. 425
  23. True
  24. 320
  25. saves electricity
  26. 360
  27. 306
  28. False
  29. saves electricity
  30. saves electricity
  31. 550
  32. saves electricity
  33. wastes electricity
  34. False
  35. 1.25
  36. switch off empty rooms
  37. True
  38. 2.5
  39. 63
  40. leave fridge door open

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