Engineering Concepts

  Logic Gates Logic gate is an electronic circuit having one or more inputs and only one output. These are the basic building blocks of a digital system. The input is related to the output based on a certain logic. The Basic logic gates are given below -  1. AND gate - For this logic gate output is "1" only when both input is "1", else "0". Output  = A . B 2. OR gate - For this logic gate output is "1", when any one of the input is "1", else "0". Output  = A+B 3. NOT gate - For this logic gate output is "1" when input is "0" and vice-versa. Output =  A̅ Derived logic gates are :-  1. NAND gate - Logic is working as NOT(AND). Output =  A . B 2. NOR gate - Logic is working as NOT(OR). Output = ( A+B ) 3. XOR gate - Output is "1" for different inputs and "0" for similar inputs. Output = (A. B̅  +  A̅.B) 4. XNOR gate - Logic is working as NOT(XOR). Output = ( A . B +  A̅ . B̅)

A Computer System is an integrated electronic device. It Consists of following main components :- 1. Central Processing Unit (Brain of the computer) Arithmetic & Logic Unit Control Unit  Memory Unit 2. Input Devices (Keyboard, Mouse etc.) 3. Output Devices (Monitor, Speaker, Printer etc.) These components are working together to give a desired output to the user in return of an input. User gives an input to the computer system using any input device like keyboard, mouse etc. in form of user friendly code. This information is transfer to the Central Processing Unit and then converted into binary format in 0's and 1's (known as the machine code).  The Central Processing Unit processes the input data, understands the requirement by user and performs the desired operation.  Then CPU transfers the output to the Output Device. The output is provide to the user in user friendly form by the output device e.g. on the monitor, speaker etc.           ...