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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 537 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
  2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  3. 3.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  5. 5.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  6. 6.True or false: to use daylight to read saves electricity. (a) False (b) True
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
  8. 8.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
  9. 9.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  10. 10.True or false: to use LED lamps wastes electricity. (a) False (b) True
  11. 11.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
  13. 13.🧾 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?
  14. 14.🧾 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?
  15. 15.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  16. 16.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  17. 17.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  18. 18.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  20. 20.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) run fans in empty rooms
  22. 22.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  23. 23.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
  24. 24.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
  25. 25.🧾 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?
  26. 26.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  27. 27.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  28. 28.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  29. 29.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
  30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  31. 31.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  33. 33.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  34. 34.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  37. 37.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  38. 38.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  39. 39.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  40. 40.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. an LED lamp
  2. wastes electricity
  3. 720
  4. 306
  5. 0.25
  6. True
  7. 1 kilowatt-hour (kWh)
  8. unplug idle chargers
  9. False
  10. False
  11. 10
  12. use LED lamps
  13. 170
  14. 315
  15. 750
  16. 1000
  17. 16
  18. True
  19. 1080
  20. 1
  21. run fans in empty rooms
  22. True
  23. set the AC to 24 °C
  24. switch off empty rooms
  25. 170
  26. 6
  27. saves electricity
  28. 12
  29. iron one shirt at a time
  30. saves electricity
  31. 7.5
  32. 450
  33. 0.6
  34. 2
  35. 510
  36. 960
  37. 5
  38. True
  39. 2.5
  40. 2.5

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