← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 356 · 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) wastes electricity (b) saves electricity
  2. 2.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  3. 3.True or false: to leave fridge door open saves electricity. (a) True (b) False
  4. 4.True or false: to use daylight to read saves electricity. (a) False (b) True
  5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
  6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use daylight to read (d) iron one shirt at a time
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
  8. 8.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  9. 9.🧾 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?
  10. 10.True or false: to use LED lamps wastes electricity. (a) False (b) True
  11. 11.True or false: to use daylight to read wastes electricity. (a) False (b) True
  12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) run fans in empty rooms (d) set the AC to 24 °C
  13. 13.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
  14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  17. 17.🧾 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
  18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
  19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) iron one shirt at a time
  20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) use LED lamps
  21. 21.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  23. 23.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  24. 24.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
  25. 25.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  27. 27.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) use LED lamps
  29. 29.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  30. 30.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
  31. 31.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  32. 32.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
  34. 34.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  35. 35.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  37. 37.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  38. 38.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  39. 39.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms

Answer key

  1. saves electricity
  2. 1
  3. False
  4. True
  5. close the fridge quickly
  6. iron one shirt at a time
  7. 1 kilowatt-hour (kWh)
  8. 0.5
  9. 306
  10. False
  11. False
  12. run fans in empty rooms
  13. leave the TV on standby
  14. saves electricity
  15. wastes electricity
  16. wastes electricity
  17. an LED lamp
  18. switch off empty rooms
  19. iron one shirt at a time
  20. run fans in empty rooms
  21. 1080
  22. False
  23. 1.25
  24. close the fridge quickly
  25. 0.1
  26. 680
  27. True
  28. use old filament bulbs
  29. 9
  30. set the AC to 24 °C
  31. wastes electricity
  32. 1.6
  33. unplug idle chargers
  34. True
  35. False
  36. 238
  37. True
  38. 2
  39. 660
  40. set the AC to 24 °C

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