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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 491 · 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 lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
  2. 2.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
  4. 4.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  5. 5.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
  7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
  8. 8.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) set the AC to 24 °C (d) use old filament bulbs
  9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
  10. 10.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  11. 11.🧾 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?
  12. 12.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) switch off empty rooms (d) use LED lamps
  16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  17. 17.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
  18. 18.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
  19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  20. 20.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  21. 21.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
  24. 24.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  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 iron one shirt at a time saves electricity. (a) True (b) False
  27. 27.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  28. 28.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
  29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) unplug idle chargers (d) switch off empty rooms
  30. 30.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  31. 31.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
  34. 34.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  35. 35.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  38. 38.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  39. 39.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  40. 40.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

Answer key

  1. an LED lamp
  2. saves electricity
  3. use LED lamps
  4. 840
  5. True
  6. 1 kilowatt-hour (kWh)
  7. use LED lamps
  8. use old filament bulbs
  9. switch off empty rooms
  10. 200
  11. 315
  12. True
  13. 459
  14. 1120
  15. use old filament bulbs
  16. wastes electricity
  17. switch off empty rooms
  18. leave the TV on standby
  19. saves electricity
  20. True
  21. 6
  22. 0.5
  23. iron one shirt at a time
  24. True
  25. 880
  26. False
  27. 1.5
  28. set the AC to 24 °C
  29. leave fridge door open
  30. 450
  31. 12
  32. 400
  33. set the AC to 24 °C
  34. 600
  35. 0.2
  36. 1280
  37. 567
  38. 15
  39. 6
  40. 1710

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