← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 694 · 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 set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  2. 2.🧾 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
  3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
  5. 5.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
  7. 7.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  8. 8.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  9. 9.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use LED lamps (d) close the fridge quickly
  11. 11.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
  12. 12.🧾 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?
  13. 13.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) unplug idle chargers
  15. 15.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  16. 16.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  17. 17.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  20. 20.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  22. 22.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  23. 23.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
  24. 24.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  25. 25.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  26. 26.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
  27. 27.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
  28. 28.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  29. 29.True or false: to use LED lamps wastes electricity. (a) False (b) True
  30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) switch off empty rooms
  32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
  33. 33.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  35. 35.True or false: to leave fridge door open saves electricity. (a) False (b) True
  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 4 hours. How many watt-hours (Wh) are saved?
  37. 37.🧾 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?
  38. 38.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  39. 39.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  40. 40.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. saves electricity
  2. an LED lamp
  3. 540
  4. switch off empty rooms
  5. 595
  6. use daylight to read
  7. 4
  8. 9
  9. True
  10. leave fridge door open
  11. use LED lamps
  12. 126
  13. True
  14. iron one shirt at a time
  15. 10
  16. False
  17. 1.2
  18. 85
  19. 80
  20. 4
  21. 567
  22. 1400
  23. leave the TV on standby
  24. 0.25
  25. False
  26. 1 kilowatt-hour (kWh)
  27. unplug idle chargers
  28. 1
  29. False
  30. wastes electricity
  31. leave the TV on standby
  32. use LED lamps
  33. 1
  34. 170
  35. False
  36. 252
  37. 306
  38. 2
  39. True
  40. 0.3

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