How is light generated through electricity?

Question

& how is electricity converted to heat for cooking?

Also if there are any websites that have the answer, the would be greatly appreciated.

Answer 1

There are several ways. The most common is to pass the electricity through a thin resistive wire. Energy will be dissipated in the wire according to the formula W = I^2*R; this will heat the wire, which can be used for cooking. If the wire gets hot enough it will emit light; it will then be used for illumination.

If you put a high-enough voltage between electrodes in a gas, the gas will break down and it's atoms will emit light. Under the right pressure conditions, this arc can be maintained. This is the basis of arc lamps used for movie projectors and searchlights, as well as fluorescent lamps. In the latter, the light produced is ultraviolet, which causes a coating of phosphors in the lamp to glow.

Finally, light can be produced through quantum mechanics, where atoms missing an electron can combine with free electrons in a semiconductor, emitting light (in some materials). That is the basis for LED lamps.

For more information see
http://en.wikipedia.org/wiki/Incandescent_lamp
http://en.wikipedia.org/wiki/Gas_discharge_lamp
http://en.wikipedia.org/wiki/Arc_discharge
http://en.wikipedia.org/wiki/Fluorescent_lamp
http://en.wikipedia.org/wiki/LED

Answer 2

As a current flows through a resistor, the electrons forming the current crash the dipoles within it and lose energy. But according to the law of Conservation of Energy, this lost energy is not faded out, and it transforms from the form of kinetic to heat. The larger the resistance of the resistor, the larger the amount of the heat. So they use resistant elements there. The element used in a bulb is Tungsten, which with being heated, glows before melting, so it produces light. The one used in a cooker is anything with a high resistance and high melting point.

Hope this helped.

Answer 3

When a current is established electrons move very slowley (about 5x10^-5 m/s!!!) These electrons collide with the atomic cores in the bulb filament, producing heat which causes the metal to glow very brightly. Why does a light turn on instanlty if the current moves so slowley? It is because the propagation (rearragment of electrons) happens at the speed of light and so a current is produced everywhere in the wire very quickly but it flows very slow.

Answer 4

.Electricity goes through a wire or some other conductor.

The resistance generates heat in the wires and the wires eventually get hot enough to generate light.

Heat is always generated before light is generated (doesn't matter whether we're talking about light bulbs or electric stoves!)
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Answer 5

Incandescent light bulbs are one of the simplest ways.
Others are arc lighting and florescent lighting.

Answer 6

it goes through particles