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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 98 · 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 ₹4. What is the bill (in ₹)?
  2. 2.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
  3. 3.🧾 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
  4. 4.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
  5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  7. 7.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) iron one shirt at a time
  9. 9.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
  11. 11.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
  12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
  13. 13.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  14. 14.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  15. 15.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  16. 16.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  18. 18.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  19. 19.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
  21. 21.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
  22. 22.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
  24. 24.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  25. 25.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) use daylight to read
  27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
  30. 30.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  32. 32.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) leave fridge door open
  33. 33.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
  34. 34.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  36. 36.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  39. 39.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  40. 40.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 80
  2. use daylight to read
  3. an LED lamp
  4. close the fridge quickly
  5. saves electricity
  6. wastes electricity
  7. False
  8. iron one shirt at a time
  9. 250
  10. switch off empty rooms
  11. run fans in empty rooms
  12. leave fridge door open
  13. 0.4
  14. False
  15. saves electricity
  16. True
  17. 210
  18. 1140
  19. 10
  20. iron one shirt at a time
  21. 1 kilowatt-hour (kWh)
  22. 600
  23. use daylight to read
  24. True
  25. 800
  26. use old filament bulbs
  27. 8
  28. 306
  29. use LED lamps
  30. 300
  31. wastes electricity
  32. unplug idle chargers
  33. leave the TV on standby
  34. False
  35. 300
  36. wastes electricity
  37. True
  38. saves electricity
  39. True
  40. 12

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