← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 73 · 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.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  2. 2.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  6. 6.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  7. 7.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  8. 8.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  9. 9.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
  10. 10.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) close the fridge quickly (d) use LED lamps
  11. 11.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
  12. 12.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
  15. 15.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
  17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  19. 19.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  20. 20.🔍 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
  21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) use old filament bulbs
  22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
  23. 23.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  24. 24.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  25. 25.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  26. 26.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
  27. 27.True or false: to use daylight to read saves electricity. (a) True (b) False
  28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  30. 30.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  31. 31.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  32. 32.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  35. 35.True or false: to use LED lamps saves electricity. (a) True (b) False
  36. 36.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
  37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
  39. 39.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  40. 40.True or false: to switch off empty rooms wastes electricity. (a) True (b) False

Answer key

  1. True
  2. 4
  3. 3
  4. 850
  5. wastes electricity
  6. saves electricity
  7. 15
  8. 80
  9. an LED lamp
  10. use old filament bulbs
  11. close the fridge quickly
  12. True
  13. saves electricity
  14. unplug idle chargers
  15. 270
  16. 1 kilowatt-hour (kWh)
  17. 459
  18. saves electricity
  19. 0.4
  20. leave fridge door open
  21. use old filament bulbs
  22. run fans in empty rooms
  23. False
  24. True
  25. wastes electricity
  26. use daylight to read
  27. True
  28. wastes electricity
  29. 1800
  30. False
  31. True
  32. 0.1
  33. 34
  34. saves electricity
  35. True
  36. run fans in empty rooms
  37. saves electricity
  38. leave the TV on standby
  39. False
  40. False

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