Electric Lighting in Building Illumination Quiz

Questions and Answers

What is the method by which light is emitted in an incandescent lamp?

Light is emitted by electrically heating a tungsten filament until it is reddish-white hot.

What causes the darkening of the glass in an incandescent lamp?

The tungsten filament evaporates and condenses on the inside of the bulb, causing the darkening of the glass.

What happens to the filament in an incandescent lamp as the current increases?

The filament gets hotter and the light gets whiter (higher color temperature).

At what temperature does Tungsten have a melting point?

Tungsten has a melting point of 3422 C. Signup and view all the answers

How does an incandescent lamp eventually wear out?

As the tungsten filament evaporates and condenses on the inside of the bulb, the filament gets thinner and eventually breaks. Signup and view all the answers

What is the operating temperature of the Tungsten filament in a typical incandescent light bulb?

approximately 2500 C Signup and view all the answers

Explain the process by which an incandescent lamp emits light.

Light is emitted by electrically heating a tungsten filament until it is reddish-white hot. By increasing the current, the filament gets hotter and the light gets whiter (higher color temperature) Signup and view all the answers

What causes the eventual wearing out of incandescent lamps?

The tungsten filament evaporates and condenses on the inside of the bulb, causing the darkening of the glass. Eventually, as the filament gets thinner, it breaks. Signup and view all the answers

What is the melting point of Tungsten?

3422 C Signup and view all the answers

In what department is Dr. Saleh Al-Saadi affiliated at Sultan Qaboos University?

Civil & Architectural Engineering Department Signup and view all the answers

Study Notes

Incandescent Lamp

Light is emitted in an incandescent lamp through the process of incandescence, where an electric current heats the filament until it glows.
The darkening of the glass in an incandescent lamp is caused by the evaporation of the tungsten filament, which deposits on the inside of the glass bulb.
As the current increases, the filament in an incandescent lamp heats up, increasing its temperature.
Tungsten has a melting point of approximately 3422°C.
Incandescent lamps eventually wear out due to the evaporation of the tungsten filament, which leads to its breakage.
The operating temperature of the Tungsten filament in a typical incandescent light bulb is approximately 2500°C.
The process by which an incandescent lamp emits light involves the filament being heated by an electric current, causing it to incandesce and produce light.
The eventual wearing out of incandescent lamps is caused by the continuous evaporation of the tungsten filament, leading to its breakage.
The melting point of Tungsten is approximately 3422°C.