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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 288 · 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.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  2. 2.True or false: to use LED lamps saves electricity. (a) True (b) False
  3. 3.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
  4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
  5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
  7. 7.🧾 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?
  8. 8.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  9. 9.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  10. 10.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  11. 11.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  12. 12.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  13. 13.True or false: to use daylight to read wastes electricity. (a) False (b) True
  14. 14.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
  15. 15.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
  16. 16.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
  17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) leave fridge door open
  18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
  19. 19.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  20. 20.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
  21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  22. 22.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  23. 23.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  24. 24.True or false: to leave fridge door open saves electricity. (a) True (b) False
  25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
  26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
  27. 27.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
  29. 29.True or false: to use daylight to read saves electricity. (a) False (b) True
  30. 30.🧾 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?
  31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) switch off empty rooms
  33. 33.🧾 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?
  34. 34.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  36. 36.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  38. 38.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  39. 39.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  40. 40.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 0.4
  2. True
  3. use daylight to read
  4. use LED lamps
  5. saves electricity
  6. leave fridge door open
  7. 85
  8. True
  9. 420
  10. 0.4
  11. 950
  12. False
  13. False
  14. switch off empty rooms
  15. set the AC to 24 °C
  16. an LED lamp
  17. unplug idle chargers
  18. run fans in empty rooms
  19. 900
  20. 1 kilowatt-hour (kWh)
  21. wastes electricity
  22. 680
  23. 16
  24. False
  25. iron one shirt at a time
  26. switch off empty rooms
  27. wastes electricity
  28. close the fridge quickly
  29. True
  30. 595
  31. saves electricity
  32. use old filament bulbs
  33. 630
  34. saves electricity
  35. 126
  36. False
  37. wastes electricity
  38. False
  39. True
  40. 0.5

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