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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 212 · 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 set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  2. 2.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) leave the TV on standby
  3. 3.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  4. 4.🧾 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?
  5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) close the fridge quickly
  6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
  7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
  8. 8.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  9. 9.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  10. 10.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
  11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  13. 13.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
  15. 15.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) iron one shirt at a time (d) unplug idle chargers
  16. 16.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  17. 17.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
  18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  21. 21.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  22. 22.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  23. 23.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) set the AC to 24 °C
  24. 24.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  25. 25.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  26. 26.True or false: to use LED lamps wastes electricity. (a) True (b) False
  27. 27.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  28. 28.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
  30. 30.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  31. 31.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
  32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  33. 33.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  34. 34.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
  36. 36.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  37. 37.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  39. 39.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
  40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) use daylight to read

Answer key

  1. saves electricity
  2. leave the TV on standby
  3. 12
  4. 340
  5. iron one shirt at a time
  6. close the fridge quickly
  7. an LED lamp
  8. saves electricity
  9. True
  10. 1 kilowatt-hour (kWh)
  11. wastes electricity
  12. wastes electricity
  13. True
  14. close the fridge quickly
  15. iron one shirt at a time
  16. 1.2
  17. set the AC to 24 °C
  18. wastes electricity
  19. 238
  20. saves electricity
  21. False
  22. 3
  23. leave fridge door open
  24. False
  25. 720
  26. False
  27. 400
  28. 5
  29. leave the TV on standby
  30. 680
  31. use daylight to read
  32. wastes electricity
  33. 2.5
  34. 350
  35. set the AC to 24 °C
  36. True
  37. 0.5
  38. 100
  39. unplug idle chargers
  40. use old filament bulbs

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