← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 534 · 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.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
  2. 2.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  3. 3.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  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 5 hours. How many watt-hours (Wh) are saved?
  5. 5.True or false: to use LED lamps saves electricity. (a) True (b) False
  6. 6.🧾 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?
  7. 7.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  8. 8.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
  9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
  10. 10.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
  11. 11.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
  12. 12.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  14. 14.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  15. 15.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
  16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
  17. 17.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
  18. 18.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
  21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) close the fridge quickly (d) use LED lamps
  22. 22.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  24. 24.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  25. 25.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C
  26. 26.🧾 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?
  27. 27.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) use old filament bulbs
  29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) run fans in empty rooms
  30. 30.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  31. 31.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  32. 32.True or false: to use daylight to read wastes electricity. (a) True (b) False
  33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  34. 34.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  35. 35.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  37. 37.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  39. 39.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  40. 40.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity

Answer key

  1. leave fridge door open
  2. False
  3. 640
  4. 255
  5. True
  6. 126
  7. 250
  8. use old filament bulbs
  9. close the fridge quickly
  10. leave the TV on standby
  11. an LED lamp
  12. 2
  13. saves electricity
  14. 4
  15. set the AC to 24 °C
  16. run fans in empty rooms
  17. 1 kilowatt-hour (kWh)
  18. False
  19. 51
  20. leave fridge door open
  21. use old filament bulbs
  22. 0.4
  23. 102
  24. True
  25. iron one shirt at a time
  26. 378
  27. 300
  28. set the AC to 24 °C
  29. use daylight to read
  30. True
  31. True
  32. False
  33. saves electricity
  34. 120
  35. 9
  36. 765
  37. False
  38. saves electricity
  39. True
  40. saves electricity

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