Light Switch

A light switch is a switch which is most commonly used to operate electric lights. It comes in a variation of designs such as the push button or the toggle switch. The most common light switch is the toggle switch as it is the switch we mainly see in our homes or daily life. By moving the switch (the toggle for example) the switch will allow an electric current to go through it so it reaches the light bulb. The switch handle does not control the contacts directly, but through an intermediate arrangement of springs and levers. Turning the handle does not initially cause any motion of the contacts, which in fact continue to be positively held open by the force of the spring. Turning the handle gradually stretches the spring. When the mechanism passes over the center point, the spring energy is released and the spring, rather than the handle, drives the contacts rapidly and forcibly to the closed position with an audible "snapping" sound. The snap-action switch is a mechanical example of negative resistance.