← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 963 · 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 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  2. 2.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
  4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  5. 5.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
  7. 7.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  8. 8.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  9. 9.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  10. 10.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
  11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) close the fridge quickly (d) switch off empty rooms
  12. 12.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  13. 13.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
  14. 14.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
  17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  18. 18.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
  19. 19.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  20. 20.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  21. 21.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
  22. 22.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  23. 23.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  24. 24.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
  26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  27. 27.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  29. 29.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  30. 30.True or false: to use LED lamps wastes electricity. (a) True (b) False
  31. 31.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  32. 32.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  33. 33.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  34. 34.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  35. 35.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  37. 37.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  40. 40.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open

Answer key

  1. 306
  2. False
  3. 1 kilowatt-hour (kWh)
  4. saves electricity
  5. True
  6. set the AC to 24 °C
  7. 0.5
  8. True
  9. False
  10. use daylight to read
  11. leave the TV on standby
  12. 400
  13. iron one shirt at a time
  14. 4
  15. 1
  16. set the AC to 24 °C
  17. saves electricity
  18. an LED lamp
  19. 1350
  20. False
  21. use LED lamps
  22. wastes electricity
  23. 1
  24. 6
  25. use LED lamps
  26. saves electricity
  27. 850
  28. 1800
  29. 8
  30. False
  31. wastes electricity
  32. True
  33. True
  34. 350
  35. 1.25
  36. 180
  37. True
  38. 252
  39. 630
  40. switch off empty rooms

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