What is information technology

What is information technology

Information Technology is a part of science . information Technology wallpaper ,

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What Is Logic Gates

Logic Gates

7 Basic Logic Gates are given below:

1. AND GATE
2. OR   GATE
3. NOT GATE
4. NAND GATE
5. NOR GATE
6. EXCLUSIVE OR (XOR GATE)
7. EXCLUSIVE NOR GATE (XNOR GATE)

AND GATE :

AND Gate work as multiplication (*). (AND GATE) have two (2) or more then two inputs and one (1) output .IN AND GATE if any input low then output low.when all input high then output high .

Boolean Expression Of  (AND GATE).

If this gate have two inputs (S,B) And output name is (N) then this gate boolean expression is.

S.B = N

(AND GATE) Symbol:

(OR GATE) Working:

Trough Table:

OR GATE :

OR GATE work as Addition (+) .OR Gate have  two or more then two inputs and have one output .IF OR GATE any input high then output high.IF all input low then output low .

Boolean Expression Of  (OR GATE).

If this gate have two inputs (S,B) And output name is (N) then this gate Boolean Expression is.

S+B = N

Symbol of OR GATE:

(OR GATE) Working:Trough Table

NOT GATE :

 Logic NOT GATE WORK as inverter.This mean convert 1 into 0 and 0 convert into 1 .Not Gate have One input (1) and have one (1) output . NOT GATE Use in Electrical Inverters such as convert Dc Supply into Ac supply 

Boolean Expression OR SYMBLAL Of  (NOT GATE).

(OR GATE) Working:
Trough Table

  

NAND GATE :

NAND GATE work opposite to AND GATE.NAND GATE SAME AS AND GATE.This gate have two or more then two inputs or one output this gate have one bubble on output side.In this gate if any input low then output high if all inputs high(1) then output low(0).

Symbol OR Boolean Expression of OR GATE:

  

Trough Table OR Working

NOR GATE:

NOR Gate have two or more then two inputs and have 1 output.NOR Gate have one bubble on output side.NOR Gate work opposite to OR Gate.NOR Gate output opposite to or gate output.If any input high then output is low if all inputs low(o) then output is high (1).

 Symbol OR Boolean Expression of (NOR GATE):

Trough Table and working OF NOR GATE :

EXCLUSIVE OR (XOR GATE):

XOR Gate have two input or one output .In XOR Gate if two same inputs then output low (zero 0)

EXP:Input (0,0) then output (0) if input (1,1) output (0),if two different inputs then output is high.

 Symbol OR Boolean Expression of (X OR GATE):

Trough Table and working OF X OR :

EXCLUSIVE NOR GATE (XNOR GATE):

X OR Gate have two inputs or one output.In (x or) gate if two same inputs then output high(1),if two different types of inputs then output is low (0).

 Symbol OR Boolean Expression of (X NOR GATE):

Trough Table and working X NOR GATE:

What is Lcd

What is Lcd

Liquid crystal display screen made of substance called liquid crystal.
The molecules of this substance line up such a way that the light behind the screen blocked or allowed to create an image.LCDs provide a shaper picture than CRTs and emit less radiation.LCD displays get input less power and take up less space than CRT.We can use lcd in two types such as computer monitor or as lCD TV because L.C.D use less power then Monitor.L.C.D is a beautiful technology then monitor.L.C.D can use on battery or UPS very easily.L.CD very less weight then CRT monitor.It is a modern technology.

What is Magnetic disk

Magnetic disk

Magnetic disk is the most widely used storage media.A magnetic disk is a thin circular metal plate/platter coated with magnetic material.Information can be recorded on or read from the magnetic surface.magnetic disk must format before magnetic disk can used.
After the formatted disk then you can store data in magnetic disk.Formatting is a process that creates tracks and sectors on the disk.Each track on a disk is divided into sectors.Any sector holds a specific number of characters.A sector is the smallest physical storage unit on a disk.Its size normally 512 bytes.
Two or more sectors combine to from a cluster .A cylinder consists of all tracks of the same number.Every cylinder contains the same number of sectors.