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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 880 · 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 use LED lamps? (a) saves electricity (b) wastes electricity
  2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  4. 4.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  5. 5.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
  6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
  7. 7.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  8. 8.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
  10. 10.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
  11. 11.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  12. 12.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
  13. 13.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
  15. 15.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  16. 16.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  17. 17.True or false: to leave fridge door open saves electricity. (a) False (b) True
  18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  20. 20.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  21. 21.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
  22. 22.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
  24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
  25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
  27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
  28. 28.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) use daylight to read
  30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  31. 31.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  33. 33.True or false: to use LED lamps saves electricity. (a) False (b) True
  34. 34.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
  38. 38.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  39. 39.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
  40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

Answer key

  1. saves electricity
  2. saves electricity
  3. wastes electricity
  4. 12
  5. switch off empty rooms
  6. use LED lamps
  7. saves electricity
  8. 0.8
  9. 1 kilowatt-hour (kWh)
  10. leave fridge door open
  11. 350
  12. an LED lamp
  13. 2.5
  14. use old filament bulbs
  15. 2
  16. 0.1
  17. False
  18. wastes electricity
  19. False
  20. True
  21. use daylight to read
  22. True
  23. switch off empty rooms
  24. leave fridge door open
  25. wastes electricity
  26. run fans in empty rooms
  27. set the AC to 24 °C
  28. 1190
  29. leave the TV on standby
  30. 360
  31. True
  32. 595
  33. True
  34. 15
  35. 16
  36. 960
  37. leave the TV on standby
  38. 240
  39. close the fridge quickly
  40. saves electricity

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