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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 727 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
  2. 2.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  3. 3.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
  5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
  6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  8. 8.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  9. 9.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  10. 10.True or false: to use LED lamps wastes electricity. (a) False (b) True
  11. 11.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) use daylight to read
  12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  13. 13.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  15. 15.True or false: to leave fridge door open saves electricity. (a) False (b) True
  16. 16.🧾 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?
  17. 17.🧾 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?
  18. 18.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  22. 22.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
  23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
  24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
  25. 25.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  26. 26.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
  30. 30.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  31. 31.True or false: to use LED lamps saves electricity. (a) True (b) False
  32. 32.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) set the AC to 24 °C
  34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
  35. 35.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) switch off empty rooms
  36. 36.🧾 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?
  37. 37.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
  38. 38.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  39. 39.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  40. 40.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity

Answer key

  1. 1 kilowatt-hour (kWh)
  2. saves electricity
  3. 1
  4. close the fridge quickly
  5. switch off empty rooms
  6. 459
  7. wastes electricity
  8. False
  9. 1.6
  10. False
  11. run fans in empty rooms
  12. saves electricity
  13. True
  14. saves electricity
  15. False
  16. 102
  17. 170
  18. 0.3
  19. 0.2
  20. saves electricity
  21. 340
  22. an LED lamp
  23. leave the TV on standby
  24. close the fridge quickly
  25. 800
  26. 15
  27. 8
  28. saves electricity
  29. iron one shirt at a time
  30. False
  31. True
  32. 6
  33. set the AC to 24 °C
  34. run fans in empty rooms
  35. switch off empty rooms
  36. 595
  37. use daylight to read
  38. 900
  39. 1.5
  40. saves electricity

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