← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 493 · 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 family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
  3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
  4. 4.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  5. 5.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  6. 6.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  8. 8.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  11. 11.True or false: to use daylight to read wastes electricity. (a) True (b) False
  12. 12.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
  13. 13.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
  14. 14.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  15. 15.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  16. 16.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  17. 17.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  19. 19.True or false: to use daylight to read saves electricity. (a) False (b) True
  20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  21. 21.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  23. 23.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  24. 24.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) run fans in empty rooms
  25. 25.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  26. 26.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  27. 27.🧾 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?
  28. 28.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  29. 29.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves 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 5 hours. How many watt-hours (Wh) are saved?
  31. 31.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
  33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  34. 34.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
  37. 37.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  38. 38.🧾 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?
  39. 39.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) use daylight to read
  40. 40.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read

Answer key

  1. 1080
  2. an LED lamp
  3. leave the TV on standby
  4. 600
  5. 6
  6. 550
  7. wastes electricity
  8. True
  9. wastes electricity
  10. 425
  11. False
  12. use LED lamps
  13. 1 kilowatt-hour (kWh)
  14. 2.5
  15. True
  16. 720
  17. 300
  18. 1.6
  19. True
  20. wastes electricity
  21. 0.4
  22. 204
  23. 2
  24. run fans in empty rooms
  25. False
  26. 1120
  27. 252
  28. 240
  29. saves electricity
  30. 315
  31. 1
  32. switch off empty rooms
  33. 540
  34. 8
  35. saves electricity
  36. leave fridge door open
  37. True
  38. 51
  39. iron one shirt at a time
  40. use daylight to read

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