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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 833 · 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 wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
  2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
  4. 4.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
  5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) use old filament bulbs
  6. 6.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
  7. 7.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
  8. 8.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  10. 10.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  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 3 hours. How many watt-hours (Wh) are saved?
  12. 12.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  13. 13.True or false: to use LED lamps wastes electricity. (a) False (b) True
  14. 14.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  16. 16.True or false: to use daylight to read wastes electricity. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) set the AC to 24 °C
  18. 18.🧾 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?
  19. 19.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
  20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  21. 21.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  23. 23.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
  24. 24.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  25. 25.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
  27. 27.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use daylight to read (d) close the fridge quickly
  29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
  31. 31.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
  34. 34.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) switch off empty rooms
  38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use LED lamps (d) unplug idle chargers
  39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  40. 40.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True

Answer key

  1. iron one shirt at a time
  2. 425
  3. 1 kilowatt-hour (kWh)
  4. leave the TV on standby
  5. use LED lamps
  6. use LED lamps
  7. an LED lamp
  8. 3
  9. wastes electricity
  10. 12
  11. 189
  12. False
  13. False
  14. 8
  15. 2.5
  16. False
  17. use old filament bulbs
  18. 378
  19. use daylight to read
  20. wastes electricity
  21. 4
  22. 1
  23. close the fridge quickly
  24. False
  25. 0.1
  26. switch off empty rooms
  27. wastes electricity
  28. leave fridge door open
  29. 600
  30. run fans in empty rooms
  31. True
  32. 350
  33. set the AC to 24 °C
  34. 360
  35. saves electricity
  36. saves electricity
  37. leave fridge door open
  38. leave the TV on standby
  39. False
  40. True

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