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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 199 · 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) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly
  2. 2.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  3. 3.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  4. 4.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
  5. 5.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  6. 6.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
  8. 8.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  9. 9.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
  10. 10.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  11. 11.🧾 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?
  12. 12.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
  13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use LED lamps
  14. 14.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  15. 15.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  16. 16.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  17. 17.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  18. 18.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  20. 20.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
  21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  22. 22.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  24. 24.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
  25. 25.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  26. 26.True or false: to use LED lamps saves electricity. (a) True (b) False
  27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  29. 29.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
  30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
  31. 31.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  32. 32.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) set the AC to 24 °C
  33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (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 6 hours. How many watt-hours (Wh) are saved?
  36. 36.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  37. 37.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity

Answer key

  1. close the fridge quickly
  2. 640
  3. 700
  4. use LED lamps
  5. True
  6. 770
  7. 1 kilowatt-hour (kWh)
  8. saves electricity
  9. switch off empty rooms
  10. 1190
  11. 170
  12. leave fridge door open
  13. iron one shirt at a time
  14. True
  15. 480
  16. True
  17. 0.4
  18. True
  19. False
  20. an LED lamp
  21. wastes electricity
  22. 0.1
  23. wastes electricity
  24. switch off empty rooms
  25. 880
  26. True
  27. wastes electricity
  28. saves electricity
  29. unplug idle chargers
  30. close the fridge quickly
  31. True
  32. set the AC to 24 °C
  33. saves electricity
  34. saves electricity
  35. 378
  36. 840
  37. 180
  38. 300
  39. saves electricity
  40. wastes electricity

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