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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 700 · 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 fridge door open? (a) saves electricity (b) wastes electricity
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
  4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  5. 5.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
  6. 6.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  7. 7.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
  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.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  11. 11.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
  13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  14. 14.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) set the AC to 24 °C
  16. 16.🧾 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?
  17. 17.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
  18. 18.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
  19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  21. 21.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
  22. 22.🧾 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?
  23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  24. 24.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  26. 26.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  27. 27.True or false: to use daylight to read saves electricity. (a) False (b) True
  28. 28.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  30. 30.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  31. 31.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  32. 32.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
  34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
  35. 35.True or false: to use LED lamps wastes electricity. (a) True (b) False
  36. 36.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  38. 38.True or false: to use LED lamps saves electricity. (a) True (b) False
  39. 39.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  40. 40.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?

Answer key

  1. an LED lamp
  2. wastes electricity
  3. 1 kilowatt-hour (kWh)
  4. wastes electricity
  5. run fans in empty rooms
  6. False
  7. False
  8. unplug idle chargers
  9. 51
  10. 400
  11. 1190
  12. leave the TV on standby
  13. saves electricity
  14. 1260
  15. set the AC to 24 °C
  16. 510
  17. iron one shirt at a time
  18. iron one shirt at a time
  19. 140
  20. saves electricity
  21. use LED lamps
  22. 63
  23. 504
  24. False
  25. saves electricity
  26. 0.5
  27. True
  28. True
  29. saves electricity
  30. True
  31. False
  32. False
  33. use daylight to read
  34. leave the TV on standby
  35. False
  36. 2.5
  37. 0.2
  38. True
  39. True
  40. 765

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