← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 723 · 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.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  2. 2.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) unplug idle chargers (d) close the fridge quickly
  4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
  6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  7. 7.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) close the fridge quickly
  9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  10. 10.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  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 2 hours. How many watt-hours (Wh) are saved?
  12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  13. 13.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  14. 14.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
  15. 15.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) close the fridge quickly
  17. 17.🧾 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?
  18. 18.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
  20. 20.🧾 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
  21. 21.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
  23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use LED lamps
  24. 24.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
  26. 26.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  27. 27.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
  28. 28.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  29. 29.🧾 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?
  30. 30.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  31. 31.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  33. 33.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
  34. 34.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  35. 35.True or false: to use LED lamps saves electricity. (a) False (b) True
  36. 36.True or false: to use daylight to read wastes electricity. (a) True (b) False
  37. 37.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  38. 38.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  39. 39.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  40. 40.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs

Answer key

  1. saves electricity
  2. 630
  3. run fans in empty rooms
  4. 306
  5. switch off empty rooms
  6. saves electricity
  7. 650
  8. run fans in empty rooms
  9. saves electricity
  10. True
  11. 126
  12. wastes electricity
  13. True
  14. use old filament bulbs
  15. True
  16. leave fridge door open
  17. 34
  18. False
  19. 1 kilowatt-hour (kWh)
  20. an LED lamp
  21. True
  22. leave fridge door open
  23. use LED lamps
  24. 0.6
  25. use daylight to read
  26. False
  27. unplug idle chargers
  28. True
  29. 153
  30. False
  31. 1.5
  32. saves electricity
  33. close the fridge quickly
  34. 2.5
  35. True
  36. False
  37. True
  38. wastes electricity
  39. 6
  40. switch off empty rooms

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids