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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 72 · 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.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  3. 3.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) use old filament bulbs
  4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  5. 5.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  6. 6.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  7. 7.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  8. 8.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  9. 9.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  11. 11.🔍 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
  12. 12.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  13. 13.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
  14. 14.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
  15. 15.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  16. 16.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) leave fridge door open
  18. 18.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
  19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
  21. 21.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  22. 22.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
  23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  24. 24.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
  27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
  28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  29. 29.True or false: to use LED lamps saves electricity. (a) True (b) False
  30. 30.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  31. 31.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
  32. 32.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
  33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  34. 34.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  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 1 hour. How many watt-hours (Wh) are saved?
  37. 37.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
  38. 38.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  39. 39.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  40. 40.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) unplug idle chargers

Answer key

  1. wastes electricity
  2. 170
  3. use old filament bulbs
  4. wastes electricity
  5. 1520
  6. 2
  7. 5
  8. 1350
  9. False
  10. 272
  11. set the AC to 24 °C
  12. 85
  13. an LED lamp
  14. use daylight to read
  15. 0.8
  16. True
  17. leave fridge door open
  18. unplug idle chargers
  19. 170
  20. use LED lamps
  21. True
  22. 1 kilowatt-hour (kWh)
  23. wastes electricity
  24. 500
  25. 252
  26. False
  27. run fans in empty rooms
  28. 360
  29. True
  30. 1330
  31. set the AC to 24 °C
  32. close the fridge quickly
  33. saves electricity
  34. True
  35. wastes electricity
  36. 63
  37. unplug idle chargers
  38. 2
  39. 0.8
  40. run fans in empty rooms

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