Understanding Electrical Energy Efficiency in Lighting
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Questions and Answers

What is the primary reason for the development of electrical engineering?

  • To enable humans to extend their working hours despite natural light and weather conditions (correct)
  • To harness thermal radiation for illumination
  • To facilitate the use of incandescent lighting
  • To explore the application of electricity in various domains

    • What prevents the tungsten filament in incandescent lamps from catching fire?

  • A vacuum-sealed bulb
  • The high melting point of tungsten
  • A sealed bulb filled with a mixture of nitrogen and an inert gas (correct)
  • An oxygen-free environment

    • What is the approximate temperature to which the tungsten filament in incandescent bulbs heats?

  • 6,000°F (3,315°C)
  • 3,000°F (1,650°C)
  • 5,000°F (2,760°C)
  • 4,532°F (2,500°C) (correct)

    • What percentage of the radiation emitted from the incandescent filament is visible light?

    <p>12%</p> Signup and view all the answers

    What is the purpose of using an inert gas such as argon in incandescent lamps?

    <p>Preventing oxidation and fire hazards</p> Signup and view all the answers

    What is the primary reason for the development of electrical engineering?

    <p>To extend working hours irrespective of natural light</p> Signup and view all the answers

    What prevents the tungsten filament in incandescent lamps from catching fire?

    <p>Inert gases such as argon</p> Signup and view all the answers

    What is the approximate temperature to which the tungsten filament in incandescent bulbs heats?

    <p>4,000°C</p> Signup and view all the answers

    What percentage of the radiation emitted from the incandescent filament is visible light?

    <p>12%</p> Signup and view all the answers

    What is incandescent lighting primarily a result of?

    <p>Thermal radiation</p> Signup and view all the answers

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