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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 195 · 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) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
  2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  3. 3.🧾 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
  4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
  5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
  6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  7. 7.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
  8. 8.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  9. 9.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  10. 10.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) run fans in empty rooms (d) set the AC to 24 °C
  12. 12.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  13. 13.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
  14. 14.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  15. 15.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  16. 16.True or false: to use LED lamps wastes electricity. (a) True (b) False
  17. 17.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
  18. 18.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
  20. 20.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  21. 21.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  24. 24.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  25. 25.True or false: to use LED lamps saves electricity. (a) False (b) True
  26. 26.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. 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 7 hours. How many watt-hours (Wh) are saved?
  28. 28.True or false: to use daylight to read saves electricity. (a) False (b) True
  29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave fridge door open
  32. 32.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  33. 33.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
  35. 35.True or false: to use daylight to read wastes electricity. (a) False (b) True
  36. 36.🧾 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?
  37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
  39. 39.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
  40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

Answer key

  1. unplug idle chargers
  2. wastes electricity
  3. an LED lamp
  4. use LED lamps
  5. set the AC to 24 °C
  6. wastes electricity
  7. use daylight to read
  8. 200
  9. 6
  10. 200
  11. run fans in empty rooms
  12. 0.8
  13. iron one shirt at a time
  14. True
  15. 238
  16. False
  17. 1 kilowatt-hour (kWh)
  18. False
  19. use LED lamps
  20. 120
  21. False
  22. saves electricity
  23. saves electricity
  24. False
  25. True
  26. 1360
  27. 357
  28. True
  29. saves electricity
  30. wastes electricity
  31. close the fridge quickly
  32. 4
  33. saves electricity
  34. leave the TV on standby
  35. False
  36. 630
  37. saves electricity
  38. leave the TV on standby
  39. switch off empty rooms
  40. 34

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