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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 881 · 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.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  2. 2.True or false: to use daylight to read saves electricity. (a) True (b) False
  3. 3.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  4. 4.True or false: to use daylight to read wastes electricity. (a) False (b) True
  5. 5.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  6. 6.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  7. 7.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
  8. 8.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  9. 9.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
  11. 11.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  12. 12.🧾 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?
  13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  14. 14.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) iron one shirt at a time (d) leave fridge door open
  15. 15.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
  16. 16.True or false: to use LED lamps saves electricity. (a) True (b) False
  17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  18. 18.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) switch off empty rooms (d) close the fridge quickly
  20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
  21. 21.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  22. 22.🧾 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
  23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  24. 24.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  25. 25.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use daylight to read (d) unplug idle chargers
  27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  28. 28.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
  29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  30. 30.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
  32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
  33. 33.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  34. 34.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
  35. 35.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
  36. 36.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) unplug idle chargers
  39. 39.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  40. 40.True or false: to switch off empty rooms wastes electricity. (a) False (b) True

Answer key

  1. saves electricity
  2. True
  3. 170
  4. False
  5. 240
  6. 0.4
  7. set the AC to 24 °C
  8. 480
  9. True
  10. 1 kilowatt-hour (kWh)
  11. 12
  12. 567
  13. wastes electricity
  14. switch off empty rooms
  15. use LED lamps
  16. True
  17. wastes electricity
  18. False
  19. leave fridge door open
  20. run fans in empty rooms
  21. 700
  22. an LED lamp
  23. saves electricity
  24. 1
  25. saves electricity
  26. run fans in empty rooms
  27. saves electricity
  28. iron one shirt at a time
  29. 400
  30. 0.1
  31. set the AC to 24 °C
  32. iron one shirt at a time
  33. 0.5
  34. leave fridge door open
  35. close the fridge quickly
  36. True
  37. wastes electricity
  38. leave the TV on standby
  39. 1
  40. False

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