Torch Bulb.

A torch bulb consists of two terminals and a filament. The filament is a spirally wound wire inside the bulb supported by two thick wires at its ends. When the positive and the negative terminals of an electric cell are connected to the two terminals of a bulb, electricity passes through the filament and it starts glowing. The terminals of the bulb are fixed in such a way that they do not touch each other. In recent years, a different type of bulb has become popular- the compact fluorescent lamp (CFL). It is an energy- saving bulb, which has a longer life than an ordinary bulb.

Working Of Torch…

Batteries generate electricity that flows to the bulb of a torch as soon as it is switched on. As a result the bulb lights up. The bulb of a torch is more or less similar to an electric bulb. The only difference is that it light up with a low current of a few volts. The batteries supply this current. As soon as the torch is switched on, the chemical present inside the batteries produces an electric current. These batteries are connected to the bulb with the help of a switch. A curved mirror is situated behind the bulb which reflects the light of the bulb in the form of a beam.

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