And gate how does it work

Each of the symbols below can be used to represent an AND gate. There are multiple international standards defined, and one may preferred over the other in your region of the world. Multiple-input gates on All About Circuits.

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So, when a gate is controlling current flow, it is actually controlling the flow of information. But the most important difference is the means of controlling the flow.

On the farm, the farmer resets the gate location by making a decision and then moving a physical barrier. A flow of animals through a complex maze of gates would require a farm hand at each gate. This voltage turns on a transistor by changing its characteristics from that of an open circuit the 'off' position to one that can conduct a small current.

This control voltage, in turn, is already available within the chip as a voltage at a point on another circuit. And, being a voltage on a circuit, this control mechanism represents a different bit of information. A computer chip therefore can be designed to make complex decisions about the information flow within itself.

This ability enables sophisticated systems to be created by interconnecting as many as a million gates within a single chip. All of this with no farm hands and no moving parts. Watson Research Center adds some complementary details: "A logic gate in a microchip is made up of a specific arrangement of transistors. A MOSFET has three components, or regions: a source region, a drain region and a channel region having a gate over it.

The three regions are arranged horizontally adjacent to one another, with the channel region in the middle. The channel region, on the other hand, is designed to be empty of electrons under normal condition, blocking the movement of current. The basic operations are described below with the aid of truth tables. It will give a low output if either, but not both , of its two inputs are high. The symbol is an EXOR gate with a small circle on the output. The small circle represents inversion.

Also note that a truth table with 'n' inputs has 2 n rows. You can compare the outputs of different gates.