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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 434 · 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.

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

Answer key

  1. False
  2. True
  3. 4
  4. 1 kilowatt-hour (kWh)
  5. saves electricity
  6. saves electricity
  7. leave the TV on standby
  8. 360
  9. 12
  10. 0.5
  11. 306
  12. unplug idle chargers
  13. iron one shirt at a time
  14. True
  15. switch off empty rooms
  16. saves electricity
  17. True
  18. leave the TV on standby
  19. saves electricity
  20. set the AC to 24 °C
  21. wastes electricity
  22. use daylight to read
  23. an LED lamp
  24. True
  25. 315
  26. 360
  27. 1
  28. iron one shirt at a time
  29. True
  30. False
  31. 490
  32. leave fridge door open
  33. 441
  34. False
  35. 0.6
  36. 5
  37. set the AC to 24 °C
  38. False
  39. False
  40. False

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