← Electricity units and saving power lesson New set →

Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 162 · 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 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
  2. 2.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  4. 4.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
  6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
  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 2 hours. How many watt-hours (Wh) are saved?
  9. 9.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  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 7 hours. How many watt-hours (Wh) are saved?
  11. 11.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  13. 13.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
  16. 16.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  17. 17.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  18. 18.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  19. 19.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
  21. 21.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  23. 23.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
  26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
  27. 27.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
  28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  29. 29.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  30. 30.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
  31. 31.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  32. 32.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  33. 33.True or false: to leave fridge door open saves electricity. (a) True (b) False
  34. 34.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
  35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
  36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
  37. 37.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

Answer key

  1. 1 kilowatt-hour (kWh)
  2. 3
  3. 16
  4. False
  5. use daylight to read
  6. wastes electricity
  7. iron one shirt at a time
  8. 126
  9. True
  10. 595
  11. False
  12. wastes electricity
  13. 2
  14. wastes electricity
  15. use LED lamps
  16. 3
  17. 640
  18. 1710
  19. True
  20. use LED lamps
  21. 10
  22. False
  23. 12
  24. saves electricity
  25. close the fridge quickly
  26. use daylight to read
  27. close the fridge quickly
  28. saves electricity
  29. False
  30. unplug idle chargers
  31. True
  32. 0.4
  33. False
  34. an LED lamp
  35. unplug idle chargers
  36. run fans in empty rooms
  37. 2
  38. saves electricity
  39. wastes electricity
  40. 630

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