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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 913 · 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.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  2. 2.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  4. 4.🧾 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
  5. 5.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) set the AC to 24 °C
  7. 7.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
  9. 9.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  10. 10.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
  11. 11.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) unplug idle chargers
  12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
  13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  15. 15.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  17. 17.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  18. 18.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  19. 19.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  20. 20.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  21. 21.🧾 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?
  22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
  23. 23.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
  24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
  25. 25.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
  26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) use daylight to read
  29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
  30. 30.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
  31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  32. 32.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  33. 33.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  34. 34.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  35. 35.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  36. 36.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
  37. 37.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  38. 38.True or false: to use daylight to read saves electricity. (a) False (b) True
  39. 39.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  40. 40.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly

Answer key

  1. True
  2. 306
  3. saves electricity
  4. an LED lamp
  5. 2.5
  6. set the AC to 24 °C
  7. 850
  8. 1 kilowatt-hour (kWh)
  9. saves electricity
  10. use LED lamps
  11. iron one shirt at a time
  12. use daylight to read
  13. 450
  14. 700
  15. True
  16. saves electricity
  17. False
  18. 140
  19. False
  20. 0.8
  21. 504
  22. run fans in empty rooms
  23. iron one shirt at a time
  24. use old filament bulbs
  25. set the AC to 24 °C
  26. wastes electricity
  27. wastes electricity
  28. leave fridge door open
  29. use daylight to read
  30. leave the TV on standby
  31. 189
  32. 4
  33. True
  34. 7.5
  35. saves electricity
  36. close the fridge quickly
  37. False
  38. True
  39. 840
  40. close the fridge quickly

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