← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 663 · 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.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  2. 2.True or false: to use daylight to read saves electricity. (a) True (b) False
  3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  4. 4.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  5. 5.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  6. 6.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  7. 7.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  8. 8.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
  9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  10. 10.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
  11. 11.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
  12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
  13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
  15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) unplug idle chargers
  16. 16.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  17. 17.True or false: to leave fridge door open saves electricity. (a) False (b) True
  18. 18.🧾 A 1000 W appliance runs for 4 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 ₹7. What is the bill (in ₹)?
  20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  21. 21.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
  22. 22.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  23. 23.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) close the fridge quickly
  24. 24.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
  25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
  26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
  27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  28. 28.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  30. 30.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
  31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
  32. 32.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
  33. 33.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  35. 35.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  36. 36.True or false: to use daylight to read wastes electricity. (a) True (b) False
  37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
  39. 39.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

Answer key

  1. saves electricity
  2. True
  3. wastes electricity
  4. 1.5
  5. 5
  6. 600
  7. True
  8. use old filament bulbs
  9. saves electricity
  10. unplug idle chargers
  11. 1 kilowatt-hour (kWh)
  12. use LED lamps
  13. saves electricity
  14. leave fridge door open
  15. run fans in empty rooms
  16. False
  17. False
  18. 4
  19. 770
  20. wastes electricity
  21. close the fridge quickly
  22. 2.5
  23. iron one shirt at a time
  24. leave the TV on standby
  25. use daylight to read
  26. close the fridge quickly
  27. 8
  28. True
  29. wastes electricity
  30. an LED lamp
  31. leave the TV on standby
  32. set the AC to 24 °C
  33. 16
  34. saves electricity
  35. wastes electricity
  36. False
  37. 126
  38. set the AC to 24 °C
  39. False
  40. 51

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