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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 653 · 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.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
  2. 2.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  4. 4.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  5. 5.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  6. 6.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
  7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) switch off empty rooms (d) unplug idle chargers
  8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  11. 11.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  12. 12.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  13. 13.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
  14. 14.True or false: to leave fridge door open saves electricity. (a) True (b) False
  15. 15.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  16. 16.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  17. 17.🧾 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?
  18. 18.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
  20. 20.🧾 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?
  21. 21.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
  22. 22.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) use daylight to read
  25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  28. 28.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  29. 29.🧾 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?
  30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
  31. 31.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
  34. 34.True or false: to use LED lamps wastes electricity. (a) True (b) False
  35. 35.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
  37. 37.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  39. 39.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  40. 40.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. use daylight to read
  2. 1.2
  3. saves electricity
  4. 1.25
  5. 16
  6. leave the TV on standby
  7. iron one shirt at a time
  8. 170
  9. saves electricity
  10. 1 kilowatt-hour (kWh)
  11. 240
  12. 0.5
  13. close the fridge quickly
  14. False
  15. 0.3
  16. True
  17. 126
  18. 5
  19. an LED lamp
  20. 204
  21. use old filament bulbs
  22. 2
  23. saves electricity
  24. leave the TV on standby
  25. 504
  26. wastes electricity
  27. wastes electricity
  28. saves electricity
  29. 153
  30. switch off empty rooms
  31. False
  32. 459
  33. leave fridge door open
  34. False
  35. True
  36. use LED lamps
  37. 6
  38. 800
  39. False
  40. 1

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