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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 712 · 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.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  2. 2.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  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 8 hours. How many watt-hours (Wh) are saved?
  4. 4.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  5. 5.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
  7. 7.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  8. 8.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
  9. 9.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  10. 10.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  11. 11.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
  13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
  16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  19. 19.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
  20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  22. 22.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  23. 23.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
  26. 26.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
  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 5 hours. How many watt-hours (Wh) are saved?
  28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
  29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
  30. 30.True or false: to use daylight to read saves electricity. (a) True (b) False
  31. 31.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
  33. 33.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  34. 34.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  35. 35.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  36. 36.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
  37. 37.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  38. 38.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  39. 39.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  40. 40.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. saves electricity
  2. False
  3. 408
  4. 2
  5. False
  6. 1 kilowatt-hour (kWh)
  7. 500
  8. close the fridge quickly
  9. 300
  10. 0.5
  11. 5
  12. unplug idle chargers
  13. 630
  14. saves electricity
  15. an LED lamp
  16. saves electricity
  17. saves electricity
  18. 595
  19. use LED lamps
  20. saves electricity
  21. wastes electricity
  22. 7.5
  23. 1.2
  24. wastes electricity
  25. use old filament bulbs
  26. leave the TV on standby
  27. 255
  28. use daylight to read
  29. iron one shirt at a time
  30. True
  31. 1330
  32. leave the TV on standby
  33. True
  34. True
  35. wastes electricity
  36. set the AC to 24 °C
  37. 6
  38. False
  39. True
  40. 1

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