← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 806 · 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.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  2. 2.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
  5. 5.True or false: to use LED lamps wastes electricity. (a) True (b) False
  6. 6.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
  8. 8.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  9. 9.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
  10. 10.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  12. 12.🧾 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?
  13. 13.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) use LED lamps (d) close the fridge quickly
  15. 15.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
  18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
  20. 20.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
  21. 21.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  22. 22.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  23. 23.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) set the AC to 24 °C (d) leave the TV on standby
  24. 24.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) use LED lamps
  26. 26.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  27. 27.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
  28. 28.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) switch off empty rooms (d) close the fridge quickly
  29. 29.🧾 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?
  30. 30.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  31. 31.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  34. 34.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  36. 36.🧾 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?
  37. 37.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
  38. 38.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
  39. 39.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  40. 40.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity

Answer key

  1. 0.8
  2. False
  3. saves electricity
  4. 1 kilowatt-hour (kWh)
  5. False
  6. 0.5
  7. use daylight to read
  8. False
  9. switch off empty rooms
  10. 360
  11. saves electricity
  12. 34
  13. 900
  14. use old filament bulbs
  15. 4
  16. saves electricity
  17. use LED lamps
  18. 560
  19. use LED lamps
  20. set the AC to 24 °C
  21. True
  22. 650
  23. leave the TV on standby
  24. 0.2
  25. leave fridge door open
  26. False
  27. an LED lamp
  28. iron one shirt at a time
  29. 126
  30. 1000
  31. 2
  32. 520
  33. 63
  34. False
  35. saves electricity
  36. 504
  37. use daylight to read
  38. switch off empty rooms
  39. 2
  40. saves electricity

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