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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 222 · 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.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
  2. 2.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
  3. 3.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  4. 4.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  5. 5.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  6. 6.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  7. 7.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
  8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
  9. 9.True or false: to use daylight to read wastes electricity. (a) False (b) True
  10. 10.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  13. 13.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  14. 14.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
  17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  18. 18.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
  20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
  21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
  22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  24. 24.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  27. 27.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
  28. 28.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  29. 29.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  30. 30.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
  31. 31.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  32. 32.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  33. 33.🧾 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?
  34. 34.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
  36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  37. 37.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
  39. 39.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs

Answer key

  1. set the AC to 24 °C
  2. leave the TV on standby
  3. True
  4. 0.6
  5. True
  6. 20
  7. leave fridge door open
  8. use LED lamps
  9. False
  10. 1170
  11. saves electricity
  12. wastes electricity
  13. False
  14. 6
  15. wastes electricity
  16. close the fridge quickly
  17. saves electricity
  18. 1
  19. 1 kilowatt-hour (kWh)
  20. leave the TV on standby
  21. switch off empty rooms
  22. 315
  23. wastes electricity
  24. 800
  25. 378
  26. wastes electricity
  27. use daylight to read
  28. 250
  29. 540
  30. close the fridge quickly
  31. True
  32. 80
  33. 238
  34. 350
  35. leave fridge door open
  36. saves electricity
  37. 12
  38. switch off empty rooms
  39. False
  40. set the AC to 24 °C

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