← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 764 · 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 daylight to read (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
  2. 2.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 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
  4. 4.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  5. 5.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) unplug idle chargers
  7. 7.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
  8. 8.True or false: to use LED lamps wastes electricity. (a) False (b) True
  9. 9.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
  10. 10.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  11. 11.True or false: to use daylight to read saves electricity. (a) False (b) True
  12. 12.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  13. 13.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  14. 14.Which of these saves electricity? (a) use daylight to read (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
  15. 15.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
  16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) run fans in empty rooms
  17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
  18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
  19. 19.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  20. 20.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  21. 21.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  22. 22.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  23. 23.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) set the AC to 24 °C
  24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
  26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  28. 28.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  29. 29.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  30. 30.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  32. 32.True or false: to leave fridge door open saves electricity. (a) False (b) True
  33. 33.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  34. 34.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
  35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) leave fridge door open
  36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  37. 37.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) use old filament bulbs (d) use daylight to read
  39. 39.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity

Answer key

  1. use daylight to read
  2. 1
  3. an LED lamp
  4. False
  5. 15
  6. unplug idle chargers
  7. close the fridge quickly
  8. False
  9. unplug idle chargers
  10. 1200
  11. True
  12. saves electricity
  13. 140
  14. use daylight to read
  15. set the AC to 24 °C
  16. switch off empty rooms
  17. iron one shirt at a time
  18. use LED lamps
  19. False
  20. 3
  21. wastes electricity
  22. saves electricity
  23. leave fridge door open
  24. saves electricity
  25. use old filament bulbs
  26. 980
  27. 189
  28. 600
  29. 80
  30. 5
  31. wastes electricity
  32. False
  33. False
  34. 1 kilowatt-hour (kWh)
  35. leave fridge door open
  36. 68
  37. False
  38. use old filament bulbs
  39. True
  40. wastes electricity

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