← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 457 · 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.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
  3. 3.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
  4. 4.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
  5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use old filament bulbs (d) unplug idle chargers
  6. 6.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
  7. 7.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
  10. 10.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
  12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  13. 13.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  15. 15.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  16. 16.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
  17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  18. 18.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
  21. 21.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  23. 23.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  24. 24.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) set the AC to 24 °C (d) run fans in empty rooms
  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 3 hours. How many watt-hours (Wh) are saved?
  27. 27.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
  30. 30.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
  31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) iron one shirt at a time
  33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  34. 34.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) use daylight to read
  35. 35.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  37. 37.True or false: to use LED lamps wastes electricity. (a) False (b) True
  38. 38.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  39. 39.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
  40. 40.True or false: to leave fridge door open saves electricity. (a) False (b) True

Answer key

  1. 150
  2. set the AC to 24 °C
  3. switch off empty rooms
  4. unplug idle chargers
  5. use old filament bulbs
  6. use old filament bulbs
  7. 8
  8. wastes electricity
  9. use daylight to read
  10. 2
  11. set the AC to 24 °C
  12. wastes electricity
  13. 0.5
  14. wastes electricity
  15. 5
  16. an LED lamp
  17. saves electricity
  18. 400
  19. saves electricity
  20. leave fridge door open
  21. 1.5
  22. saves electricity
  23. False
  24. True
  25. run fans in empty rooms
  26. 255
  27. 4
  28. saves electricity
  29. leave fridge door open
  30. 1 kilowatt-hour (kWh)
  31. 315
  32. iron one shirt at a time
  33. saves electricity
  34. run fans in empty rooms
  35. 3
  36. 420
  37. False
  38. False
  39. leave the TV on standby
  40. False

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