← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 107 · 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 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?
  2. 2.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  3. 3.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
  4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  5. 5.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
  6. 6.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
  9. 9.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  10. 10.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
  12. 12.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  14. 14.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  15. 15.🧾 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?
  16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
  17. 17.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  18. 18.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  19. 19.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
  20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
  22. 22.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  24. 24.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
  26. 26.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
  27. 27.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
  29. 29.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) switch off empty rooms (d) close the fridge quickly
  30. 30.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  32. 32.🧾 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?
  33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  34. 34.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  35. 35.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  36. 36.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  39. 39.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
  40. 40.True or false: to use LED lamps wastes electricity. (a) False (b) True

Answer key

  1. 378
  2. 0.2
  3. close the fridge quickly
  4. wastes electricity
  5. unplug idle chargers
  6. 12
  7. wastes electricity
  8. an LED lamp
  9. True
  10. True
  11. run fans in empty rooms
  12. 880
  13. saves electricity
  14. True
  15. 102
  16. 1 kilowatt-hour (kWh)
  17. False
  18. 1200
  19. leave fridge door open
  20. 340
  21. close the fridge quickly
  22. False
  23. wastes electricity
  24. True
  25. switch off empty rooms
  26. use LED lamps
  27. 2.5
  28. unplug idle chargers
  29. use old filament bulbs
  30. 0.25
  31. 204
  32. 255
  33. saves electricity
  34. saves electricity
  35. 840
  36. 8
  37. 16
  38. 2
  39. set the AC to 24 °C
  40. False

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