Chlorine Correct Answer: Nitrogen We were unable to load Disqus.

A light bulb produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and for many other purposes. Billions are in use, some even in outer space. Early people used candles and oil lamps for light.

An electric bulb refers to an electric lamp which consists of a translucent or transparent glass housing. It is also known as a light bulb. This simple device has been used for the purpose of illumination for more than a century. Electric bulb refers to a device which produces light on the application of electricity.

Mercury vapor

1 Answer. Tungsten is used for making the filaments of electric bulbs because it has a very high melting point. Due to its very high melting point, the tungsten filament can be kept white hot without melting away. Also, tungsten has high flexibility and low rate of evaporation at high temperature.

Tungsten is used for making filament of an electric bulb due to the following reasons: Being an alloy it has a very high melting point. It has very high resistivity so it does not burn easily at room temperature. The lamp glows at high temperatures.

The temperature of the electric lamps is extremely high. Hence, tungsten is mainly used as the heating element of electric bulbs. Tungsten has a very high melting point and very high resistivity so does not burn easily at a high temperature.

Tungsten has low resistivity. It is a good conductor of electricity and has a high melting point. low resistivity .

Tungsten has a veery high melting point, so a it will melt only in case a very high amount of current passes through the circuit. But for lower ranges of current which yet might be harmful for appliances will not be cut off by a tungsten fuse. So it cannot be used in a fuse wire.

✔Tungsten is not used as a fuse wire because it has high melting point. ✔Fuse wire needs low melting point so that it can melt when current flows more than the limit.

If tungsten is used as a fuse wire, it will not melt if the current goes beyond 15A, and it will fail to safeguard appliances like refrigerator, AC etc. which will eventually cause damage to the appliances and other circuit elements.

The fuse element is made of zinc, copper, silver, aluminum, or alloys among these or other various metals to provide stable and predictable characteristics. The fuse ideally would carry its rated current indefinitely, and melt quickly on a small excess.

We cannot use a metallic wire as a fuse wire because it’s temperature will not rise faster than the connecting copper wire in case of overload.

Properties of Fuse Wire

• Low melting point, so that it breaks as soon as current higher than permissible value passes through it.
• Low resistivity, so that it doesn’t interfere with the flow of current.