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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 386 · 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 of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
  2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
  3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) use old filament bulbs
  5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use daylight to read (d) use LED lamps
  6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  7. 7.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use old filament bulbs (d) switch off empty rooms
  8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) use daylight to read
  10. 10.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
  12. 12.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
  13. 13.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  15. 15.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
  16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) switch off empty rooms (d) iron one shirt at a time
  18. 18.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
  20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
  21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
  22. 22.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  24. 24.True or false: to use daylight to read saves electricity. (a) False (b) True
  25. 25.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  26. 26.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  27. 27.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  30. 30.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  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 7 hours. How many watt-hours (Wh) are saved?
  32. 32.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  34. 34.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  35. 35.True or false: to use LED lamps wastes electricity. (a) False (b) True
  36. 36.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
  37. 37.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  39. 39.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity

Answer key

  1. use LED lamps
  2. an LED lamp
  3. saves electricity
  4. set the AC to 24 °C
  5. leave fridge door open
  6. wastes electricity
  7. use old filament bulbs
  8. 102
  9. run fans in empty rooms
  10. True
  11. unplug idle chargers
  12. leave fridge door open
  13. saves electricity
  14. saves electricity
  15. use daylight to read
  16. wastes electricity
  17. iron one shirt at a time
  18. 6
  19. 1 kilowatt-hour (kWh)
  20. leave the TV on standby
  21. use old filament bulbs
  22. False
  23. 990
  24. True
  25. 0.5
  26. 0.2
  27. True
  28. wastes electricity
  29. 850
  30. 15
  31. 595
  32. 0.25
  33. wastes electricity
  34. True
  35. False
  36. leave the TV on standby
  37. 0.5
  38. 126
  39. 360
  40. wastes electricity

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