← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 531 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
  2. 2.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) set the AC to 24 °C (d) switch off empty rooms
  3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
  4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  5. 5.🧾 A 1500 W appliance runs for 4 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 leave fridge door open wastes electricity. (a) False (b) True
  8. 8.🧾 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?
  9. 9.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) leave fridge door open
  11. 11.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  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 7 hours. How many watt-hours (Wh) are saved?
  13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) close the fridge quickly
  14. 14.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  16. 16.True or false: to leave fridge door open saves electricity. (a) True (b) False
  17. 17.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  18. 18.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
  19. 19.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  23. 23.True or false: to use daylight to read wastes electricity. (a) False (b) True
  24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) use old filament bulbs
  25. 25.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  26. 26.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  27. 27.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  28. 28.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  31. 31.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  33. 33.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
  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 iron one shirt at a time? (a) wastes electricity (b) saves electricity
  36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
  37. 37.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
  38. 38.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
  40. 40.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 1 kilowatt-hour (kWh)
  2. use old filament bulbs
  3. close the fridge quickly
  4. 459
  5. 6
  6. 600
  7. True
  8. 189
  9. 400
  10. leave fridge door open
  11. 8
  12. 238
  13. iron one shirt at a time
  14. 1.2
  15. 0.1
  16. False
  17. 1800
  18. switch off empty rooms
  19. 1400
  20. 1050
  21. 357
  22. saves electricity
  23. False
  24. use daylight to read
  25. True
  26. saves electricity
  27. 8
  28. 3
  29. saves electricity
  30. 441
  31. 1440
  32. saves electricity
  33. an LED lamp
  34. False
  35. wastes electricity
  36. use LED lamps
  37. use daylight to read
  38. 10
  39. switch off empty rooms
  40. 10

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