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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 566 · 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) use LED lamps (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
  2. 2.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
  3. 3.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
  4. 4.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  5. 5.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  6. 6.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  7. 7.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  9. 9.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
  10. 10.🧾 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
  11. 11.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave fridge door open
  13. 13.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  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 3 hours. How many watt-hours (Wh) are saved?
  16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) switch off empty rooms
  17. 17.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
  18. 18.True or false: to use LED lamps saves electricity. (a) True (b) False
  19. 19.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  20. 20.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  21. 21.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  22. 22.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
  24. 24.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  25. 25.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
  27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  28. 28.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
  30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  32. 32.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  35. 35.True or false: to use daylight to read wastes electricity. (a) False (b) True
  36. 36.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) close the fridge quickly (d) switch off empty rooms
  37. 37.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
  39. 39.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

Answer key

  1. use LED lamps
  2. unplug idle chargers
  3. switch off empty rooms
  4. True
  5. 3
  6. 1020
  7. 840
  8. 1 kilowatt-hour (kWh)
  9. iron one shirt at a time
  10. an LED lamp
  11. saves electricity
  12. leave fridge door open
  13. True
  14. wastes electricity
  15. 102
  16. run fans in empty rooms
  17. close the fridge quickly
  18. True
  19. True
  20. 350
  21. True
  22. False
  23. iron one shirt at a time
  24. 255
  25. wastes electricity
  26. use daylight to read
  27. saves electricity
  28. 480
  29. use LED lamps
  30. wastes electricity
  31. 1190
  32. False
  33. wastes electricity
  34. saves electricity
  35. False
  36. use old filament bulbs
  37. 16
  38. leave fridge door open
  39. 0.2
  40. 420

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