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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 40 · 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 use old filament bulbs wastes electricity. (a) True (b) False
  2. 2.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
  4. 4.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
  6. 6.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  7. 7.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  9. 9.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
  10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  11. 11.🧾 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?
  12. 12.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) set the AC to 24 °C (d) unplug idle chargers
  13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
  14. 14.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
  17. 17.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  18. 18.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) close the fridge quickly (d) use LED lamps
  19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  20. 20.True or false: to leave fridge door open saves electricity. (a) True (b) False
  21. 21.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  22. 22.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
  26. 26.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  28. 28.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
  30. 30.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
  31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  34. 34.🧾 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?
  35. 35.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  36. 36.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  37. 37.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  38. 38.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  40. 40.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. True
  2. close the fridge quickly
  3. 1 kilowatt-hour (kWh)
  4. 12
  5. set the AC to 24 °C
  6. 3
  7. 720
  8. wastes electricity
  9. switch off empty rooms
  10. saves electricity
  11. 378
  12. leave the TV on standby
  13. unplug idle chargers
  14. 10
  15. saves electricity
  16. switch off empty rooms
  17. True
  18. use old filament bulbs
  19. saves electricity
  20. False
  21. False
  22. False
  23. 189
  24. 63
  25. set the AC to 24 °C
  26. wastes electricity
  27. 136
  28. 0.2
  29. leave fridge door open
  30. an LED lamp
  31. 300
  32. saves electricity
  33. wastes electricity
  34. 170
  35. True
  36. 9
  37. False
  38. 480
  39. 680
  40. 0.5

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