← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 929 · 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 is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
  2. 2.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) use old filament bulbs
  4. 4.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) iron one shirt at a time
  5. 5.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  6. 6.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  7. 7.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  8. 8.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
  9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  10. 10.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  11. 11.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  12. 12.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  13. 13.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  17. 17.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
  18. 18.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  19. 19.True or false: to use LED lamps wastes electricity. (a) False (b) True
  20. 20.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  21. 21.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) set the AC to 24 °C
  22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  23. 23.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  24. 24.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  25. 25.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  26. 26.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  27. 27.🧾 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
  28. 28.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
  29. 29.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  31. 31.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  32. 32.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
  34. 34.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
  37. 37.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  40. 40.True or false: to close the fridge quickly wastes electricity. (a) True (b) False

Answer key

  1. leave fridge door open
  2. True
  3. set the AC to 24 °C
  4. use daylight to read
  5. 6
  6. 630
  7. saves electricity
  8. switch off empty rooms
  9. wastes electricity
  10. 0.2
  11. 0.8
  12. 1350
  13. 0.5
  14. wastes electricity
  15. saves electricity
  16. wastes electricity
  17. close the fridge quickly
  18. saves electricity
  19. False
  20. 357
  21. iron one shirt at a time
  22. saves electricity
  23. 160
  24. False
  25. 1
  26. 800
  27. an LED lamp
  28. 1 kilowatt-hour (kWh)
  29. saves electricity
  30. wastes electricity
  31. 840
  32. True
  33. use LED lamps
  34. False
  35. 102
  36. iron one shirt at a time
  37. True
  38. 85
  39. 272
  40. False

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