how a torch works?

Question

can anyone give me an explanation on how a torch works?

can anyone give me an explanation of how a battery torch works?

Answer 1

What kind of torch?

Ok, much better!

First, there's a light bulb, it is a glass tube that has all the air out, so there is a gaseous vacuum inside. Inside this vacuum are two metal post with a "filament" connected between them. The filament is made from a tungsten alloy which heats to burning when an electric current passes thru it. Because there is no air, it burns brightly but does not combust into flames. It just gives off a bright light.
Second, there are batteries. These are chemical/metal reactors that produce direct electrical current when connected to a circuit.
Third, there is the electrical circuit inside the housing. This consist of contacts and a switch encapsulated with a reflector that directs the light.

Switching on the switch connects the circuit, and allows the electric current to flow, which is produced thru a chemical reaction inside the batteries. As the current passes thru the filament, it heats to glowing and gives off light.

Some newer flashlights use Light Emiting Diodes, or LEDs to produce the light, they work similarly to the lightbulb, but consist of circuitry encased inside heat resistant plastic or glass. They can produce very intense light and are much more damage resistant than glass bulbs, a very important thing in emergencies.

Answer 2

Hey, guys! He/she is asking about a BRITISH torch, meaning, in American, a flashlight.

In a flashlight (torch) using an incandescent light bulb, the current from a battery passes through a thin filament, in the bulb, that resists the current in such a way that tremendous heat is generated. This heat causes the filament to glow, brightly, casting light in all directions. The reflector in the end of the torch reflects most of the light forward, out the front of the flashlight.

Some, newer models do not use an incandescent bulb, but, rather use Light Emitting Diodes (LEDs). When current from the batteries passes through, it causes the LEDs to glow WITHOUT producing heat. Here, specially shaped lenses which may or may not be part of the LED direct the light forward.

Answer 3

Originally, a torch was a portable source of fire used as a source of light, usually a rod-shaped piece of wood with a rag soaked in pitch and/or some other flammable material wrapped around one end. Torches were often supported in sconces by brackets high up on walls, to throw light over corridors in stone structures such as castles or crypts.

Answer 4

"wind up" implies a spring it truly is being wound up. yet I not in any respect observed a flashlight like that. perchance you're concerning those the position you flow something decrease from side to side? those have an electric powered generator that recharges a battery. .