The Function and Evolution of the Light Bulb

The video tutorial explores the history and invention of the light bulb, highlighting Thomas Edison's role in its development. It explains the working mechanism of incandescent bulbs, focusing on the conversion of electric energy into light and heat. The tutorial also compares traditional incandescent bulbs with modern alternatives like LEDs and fluorescent lights, emphasizing their energy efficiency and cost-effectiveness.

Who is credited with patenting the first commercially viable light bulb?

• Nikola Tesla

• Thomas Edison

• Alexander Graham Bell

• James Watt

What is the primary function of the glass vacuum bulb in an incandescent light bulb?

• To enhance brightness

• To prevent the filament from burning out quickly

• To reduce electricity consumption

• To change the color of the light

How does an incandescent light bulb produce light?

• Through chemical reactions

• By heating a filament until it glows

• Through magnetic fields

• By using solar energy

Which type of modern light bulb is known for being energy efficient and producing mostly visible light?

• Incandescent bulbs

• Halogen bulbs

• LEDs

• Neon lights

What percentage of light produced by incandescent bulbs is in the visible spectrum?

• 50%

• 25%

• 10%

• 75%