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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 753 · 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 family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  2. 2.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
  3. 3.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
  5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  7. 7.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  8. 8.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
  9. 9.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
  10. 10.🧾 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?
  11. 11.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  12. 12.True or false: to use LED lamps wastes electricity. (a) True (b) False
  13. 13.🧾 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
  14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
  16. 16.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
  18. 18.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
  21. 21.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
  22. 22.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  24. 24.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  25. 25.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  26. 26.True or false: to use daylight to read wastes electricity. (a) False (b) True
  27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
  28. 28.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
  29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  30. 30.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
  31. 31.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  32. 32.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  33. 33.True or false: to leave fridge door open saves electricity. (a) False (b) True
  34. 34.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
  35. 35.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  36. 36.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) use daylight to read (d) set the AC to 24 °C
  37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  39. 39.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  40. 40.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 140
  2. set the AC to 24 °C
  3. 4
  4. set the AC to 24 °C
  5. wastes electricity
  6. wastes electricity
  7. saves electricity
  8. use old filament bulbs
  9. 1 kilowatt-hour (kWh)
  10. 255
  11. 1120
  12. False
  13. an LED lamp
  14. saves electricity
  15. run fans in empty rooms
  16. 500
  17. iron one shirt at a time
  18. 630
  19. saves electricity
  20. iron one shirt at a time
  21. close the fridge quickly
  22. 250
  23. wastes electricity
  24. True
  25. 2
  26. False
  27. switch off empty rooms
  28. close the fridge quickly
  29. 51
  30. leave fridge door open
  31. 770
  32. 3
  33. False
  34. unplug idle chargers
  35. True
  36. leave the TV on standby
  37. saves electricity
  38. 510
  39. 16
  40. 0.2

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