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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 184 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
  2. 2.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
  5. 5.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  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 of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
  9. 9.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
  11. 11.🧾 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?
  12. 12.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
  17. 17.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  19. 19.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  21. 21.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  22. 22.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  24. 24.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
  27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  28. 28.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  29. 29.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  30. 30.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) iron one shirt at a time
  31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  32. 32.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  35. 35.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
  36. 36.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
  37. 37.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  39. 39.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  40. 40.True or false: to close the fridge quickly saves electricity. (a) True (b) False

Answer key

  1. 1 kilowatt-hour (kWh)
  2. saves electricity
  3. 204
  4. close the fridge quickly
  5. 1
  6. wastes electricity
  7. 315
  8. switch off empty rooms
  9. 1080
  10. an LED lamp
  11. 153
  12. 480
  13. 378
  14. wastes electricity
  15. wastes electricity
  16. leave fridge door open
  17. True
  18. saves electricity
  19. True
  20. saves electricity
  21. True
  22. saves electricity
  23. wastes electricity
  24. 3
  25. saves electricity
  26. unplug idle chargers
  27. 1440
  28. 12
  29. False
  30. iron one shirt at a time
  31. 306
  32. 2.5
  33. 6
  34. wastes electricity
  35. close the fridge quickly
  36. run fans in empty rooms
  37. 2.5
  38. saves electricity
  39. False
  40. True

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