← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 100 · 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 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
  2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
  3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  4. 4.🔍 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) close the fridge quickly
  5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
  6. 6.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  7. 7.🧾 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?
  8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
  9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
  10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
  11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
  12. 12.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  13. 13.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  15. 15.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  16. 16.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
  17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
  20. 20.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  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.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  23. 23.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  24. 24.True or false: to use daylight to read wastes electricity. (a) False (b) True
  25. 25.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  28. 28.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  31. 31.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  32. 32.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  33. 33.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  34. 34.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  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 3 hours. How many watt-hours (Wh) are saved?
  38. 38.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  39. 39.True or false: to use LED lamps wastes electricity. (a) True (b) False
  40. 40.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 1 kilowatt-hour (kWh)
  2. iron one shirt at a time
  3. saves electricity
  4. close the fridge quickly
  5. use LED lamps
  6. 1.5
  7. 315
  8. iron one shirt at a time
  9. leave fridge door open
  10. switch off empty rooms
  11. an LED lamp
  12. 960
  13. False
  14. saves electricity
  15. True
  16. close the fridge quickly
  17. 1520
  18. wastes electricity
  19. use LED lamps
  20. 10
  21. 357
  22. 240
  23. 16
  24. False
  25. 1
  26. wastes electricity
  27. saves electricity
  28. 680
  29. 510
  30. wastes electricity
  31. saves electricity
  32. 240
  33. False
  34. 2
  35. 0.2
  36. 200
  37. 153
  38. False
  39. False
  40. 4

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