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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 608 · 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 is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave fridge door open
  2. 2.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
  4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
  5. 5.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  6. 6.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
  7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
  8. 8.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
  9. 9.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
  10. 10.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open
  11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
  12. 12.True or false: to use LED lamps wastes electricity. (a) False (b) True
  13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
  16. 16.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  17. 17.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  18. 18.True or false: to use daylight to read wastes electricity. (a) False (b) True
  19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  21. 21.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  23. 23.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  24. 24.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
  25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  26. 26.True or false: to use LED lamps saves electricity. (a) False (b) True
  27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  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 5 hours. How many watt-hours (Wh) are saved?
  29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  30. 30.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. 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 wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) unplug idle chargers
  33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) close the fridge quickly (d) set the AC to 24 °C
  34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  35. 35.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  36. 36.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  37. 37.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  38. 38.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  39. 39.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  40. 40.True or false: to leave fridge door open saves electricity. (a) True (b) False

Answer key

  1. close the fridge quickly
  2. leave the TV on standby
  3. 1 kilowatt-hour (kWh)
  4. use daylight to read
  5. 1280
  6. switch off empty rooms
  7. switch off empty rooms
  8. iron one shirt at a time
  9. an LED lamp
  10. leave fridge door open
  11. use LED lamps
  12. False
  13. saves electricity
  14. wastes electricity
  15. set the AC to 24 °C
  16. 760
  17. 10
  18. False
  19. saves electricity
  20. wastes electricity
  21. 1.6
  22. saves electricity
  23. 700
  24. use LED lamps
  25. saves electricity
  26. True
  27. 153
  28. 170
  29. 450
  30. 560
  31. wastes electricity
  32. iron one shirt at a time
  33. leave the TV on standby
  34. 34
  35. 4
  36. True
  37. 6
  38. False
  39. 1040
  40. False

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