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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 2 · 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 iron one shirt at a time wastes electricity. (a) False (b) True
  2. 2.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use old filament bulbs (d) leave fridge door open
  3. 3.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) use old filament bulbs
  4. 4.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  5. 5.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
  7. 7.🧾 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?
  8. 8.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  10. 10.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  11. 11.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  13. 13.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
  14. 14.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  17. 17.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) iron one shirt at a time (d) leave fridge door open
  18. 18.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
  19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  20. 20.🧾 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?
  21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  22. 22.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  23. 23.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  25. 25.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
  27. 27.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
  28. 28.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  30. 30.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) set the AC to 24 °C
  31. 31.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) close the fridge quickly (d) set the AC to 24 °C
  32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
  34. 34.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  36. 36.True or false: to use LED lamps saves electricity. (a) False (b) True
  37. 37.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  38. 38.🧾 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?
  39. 39.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) iron one shirt at a time

Answer key

  1. True
  2. close the fridge quickly
  3. use daylight to read
  4. True
  5. 0.6
  6. use LED lamps
  7. 630
  8. 0.5
  9. saves electricity
  10. True
  11. False
  12. wastes electricity
  13. 1 kilowatt-hour (kWh)
  14. 4
  15. 0.5
  16. saves electricity
  17. switch off empty rooms
  18. an LED lamp
  19. 378
  20. 850
  21. saves electricity
  22. True
  23. saves electricity
  24. wastes electricity
  25. 1.2
  26. unplug idle chargers
  27. use old filament bulbs
  28. 4
  29. 1200
  30. set the AC to 24 °C
  31. run fans in empty rooms
  32. wastes electricity
  33. set the AC to 24 °C
  34. False
  35. 153
  36. True
  37. 240
  38. 510
  39. True
  40. iron one shirt at a time

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