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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 424 · 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.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
  3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) switch off empty rooms
  7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) run fans in empty rooms
  8. 8.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  9. 9.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
  11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
  12. 12.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) close the fridge quickly
  13. 13.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
  15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
  16. 16.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
  17. 17.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  18. 18.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
  19. 19.True or false: to use daylight to read wastes electricity. (a) False (b) True
  20. 20.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) close the fridge quickly (d) use old filament bulbs
  21. 21.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  22. 22.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  24. 24.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
  25. 25.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use daylight to read (d) unplug idle chargers
  26. 26.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  28. 28.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  29. 29.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  30. 30.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  32. 32.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  33. 33.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  35. 35.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
  36. 36.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  37. 37.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  38. 38.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
  40. 40.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. True
  2. 1 kilowatt-hour (kWh)
  3. 300
  4. saves electricity
  5. saves electricity
  6. leave fridge door open
  7. run fans in empty rooms
  8. 2
  9. 1.5
  10. an LED lamp
  11. use LED lamps
  12. leave the TV on standby
  13. False
  14. close the fridge quickly
  15. close the fridge quickly
  16. leave fridge door open
  17. 0.5
  18. set the AC to 24 °C
  19. False
  20. use old filament bulbs
  21. 1440
  22. True
  23. 170
  24. use LED lamps
  25. leave the TV on standby
  26. 1440
  27. wastes electricity
  28. False
  29. 1
  30. saves electricity
  31. saves electricity
  32. True
  33. False
  34. wastes electricity
  35. iron one shirt at a time
  36. 0.2
  37. saves electricity
  38. wastes electricity
  39. iron one shirt at a time
  40. 1

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