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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 672 · 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 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
  2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
  3. 3.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  4. 4.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  5. 5.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
  6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
  7. 7.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave fridge door open
  8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
  10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) unplug idle chargers
  11. 11.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  13. 13.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) switch off empty rooms
  15. 15.🧾 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?
  16. 16.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
  18. 18.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
  19. 19.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  20. 20.🧾 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?
  21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  23. 23.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  24. 24.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  25. 25.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  26. 26.🧾 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?
  27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
  28. 28.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  29. 29.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
  31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  32. 32.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  33. 33.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  34. 34.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  35. 35.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  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 5 hours. How many watt-hours (Wh) are saved?
  37. 37.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  38. 38.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
  39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  40. 40.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 1 kilowatt-hour (kWh)
  2. iron one shirt at a time
  3. 1600
  4. False
  5. close the fridge quickly
  6. leave the TV on standby
  7. set the AC to 24 °C
  8. saves electricity
  9. close the fridge quickly
  10. run fans in empty rooms
  11. False
  12. wastes electricity
  13. 1
  14. leave fridge door open
  15. 630
  16. True
  17. set the AC to 24 °C
  18. an LED lamp
  19. 240
  20. 102
  21. saves electricity
  22. 102
  23. False
  24. False
  25. 1120
  26. 170
  27. use daylight to read
  28. 1120
  29. False
  30. use LED lamps
  31. wastes electricity
  32. True
  33. 10
  34. True
  35. saves electricity
  36. 425
  37. 700
  38. use daylight to read
  39. wastes electricity
  40. 2.5

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