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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 494 · 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.

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  1. 1.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
  3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
  4. 4.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  5. 5.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  6. 6.🧾 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?
  7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) switch off empty rooms (d) use LED lamps
  8. 8.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  9. 9.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  10. 10.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
  12. 12.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  13. 13.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  14. 14.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  15. 15.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
  16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
  17. 17.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  18. 18.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
  20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
  21. 21.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) use LED lamps
  23. 23.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  24. 24.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  25. 25.True or false: to leave fridge door open saves electricity. (a) False (b) True
  26. 26.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
  28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
  29. 29.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers
  30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  31. 31.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  32. 32.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  34. 34.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
  35. 35.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
  36. 36.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
  37. 37.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  38. 38.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  40. 40.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. wastes electricity
  2. 1 kilowatt-hour (kWh)
  3. use daylight to read
  4. 320
  5. wastes electricity
  6. 595
  7. leave the TV on standby
  8. False
  9. 800
  10. 0.8
  11. use LED lamps
  12. 420
  13. wastes electricity
  14. False
  15. an LED lamp
  16. use daylight to read
  17. True
  18. 6
  19. set the AC to 24 °C
  20. run fans in empty rooms
  21. 2.5
  22. leave fridge door open
  23. False
  24. 1.5
  25. False
  26. False
  27. leave fridge door open
  28. switch off empty rooms
  29. unplug idle chargers
  30. saves electricity
  31. saves electricity
  32. 0.1
  33. 2.5
  34. set the AC to 24 °C
  35. iron one shirt at a time
  36. leave the TV on standby
  37. 8
  38. False
  39. wastes electricity
  40. 5

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