← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 351 · 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 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
  3. 3.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  4. 4.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  5. 5.True or false: to use daylight to read wastes electricity. (a) True (b) False
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
  7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
  8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
  9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  10. 10.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  11. 11.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  12. 12.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  13. 13.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
  14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) leave fridge door open
  15. 15.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  16. 16.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  17. 17.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) unplug idle chargers (d) close the fridge quickly
  18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
  19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
  21. 21.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  22. 22.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  23. 23.🧾 A 50 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) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
  25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
  26. 26.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  27. 27.True or false: to use LED lamps saves electricity. (a) True (b) False
  28. 28.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  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 1 hour. How many watt-hours (Wh) are saved?
  30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  32. 32.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
  34. 34.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) use old filament bulbs (d) unplug idle chargers
  36. 36.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  37. 37.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time

Answer key

  1. 880
  2. set the AC to 24 °C
  3. 2
  4. False
  5. False
  6. 1 kilowatt-hour (kWh)
  7. an LED lamp
  8. iron one shirt at a time
  9. wastes electricity
  10. 640
  11. 720
  12. 6
  13. close the fridge quickly
  14. leave fridge door open
  15. 540
  16. 1.25
  17. use old filament bulbs
  18. set the AC to 24 °C
  19. wastes electricity
  20. close the fridge quickly
  21. 0.4
  22. True
  23. 0.4
  24. leave the TV on standby
  25. run fans in empty rooms
  26. 2
  27. True
  28. 1.2
  29. 63
  30. wastes electricity
  31. 650
  32. 720
  33. unplug idle chargers
  34. True
  35. use old filament bulbs
  36. 180
  37. 1620
  38. wastes electricity
  39. saves electricity
  40. use LED lamps

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