← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 507 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
  2. 2.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
  3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
  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 4 hours. How many watt-hours (Wh) are saved?
  5. 5.🧾 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?
  6. 6.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
  7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
  8. 8.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use daylight to read (d) use LED lamps
  10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
  11. 11.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  12. 12.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
  14. 14.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  17. 17.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
  18. 18.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
  21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  22. 22.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  24. 24.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
  25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
  26. 26.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  27. 27.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  28. 28.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  30. 30.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  31. 31.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  33. 33.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  34. 34.True or false: to use daylight to read wastes electricity. (a) True (b) False
  35. 35.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) use old filament bulbs
  36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  37. 37.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  40. 40.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C

Answer key

  1. an LED lamp
  2. use daylight to read
  3. leave the TV on standby
  4. 204
  5. 238
  6. leave the TV on standby
  7. switch off empty rooms
  8. 10
  9. leave fridge door open
  10. run fans in empty rooms
  11. 2.5
  12. 16
  13. 1 kilowatt-hour (kWh)
  14. 3
  15. 2.5
  16. saves electricity
  17. use old filament bulbs
  18. 0.4
  19. 660
  20. set the AC to 24 °C
  21. 300
  22. saves electricity
  23. wastes electricity
  24. unplug idle chargers
  25. use daylight to read
  26. 0.1
  27. False
  28. 150
  29. 400
  30. True
  31. 1.6
  32. 720
  33. True
  34. False
  35. switch off empty rooms
  36. saves electricity
  37. 2
  38. 0.4
  39. 504
  40. set the AC to 24 °C

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