Friday, 20 March 2015

describe briefly importance and function of CPU in the computer?explain the human brain preform?

CENTRAL PROCESSING UNIT (CPU):
CPU is the brain of the computer. the CPU is as important to the computer as brain is to use. it is the main chip that is fixed on the motherboard. CPU is also called as microprocessor. the word micro means small. so micro processor is a small chip of about 1 square inch in size. CPU reads and executes the program instructions, preforms calculations and makes decisions. it is also responsible for storing and retrieving information on storage disks or other storage media. it also handles the flow of information from one part of the computer to another.
HUMAN BRAIN PERFORMS:

as you know that CPU performs the task in 4 steps. it is similar to the way the human brain does. to understands in better consider, the example in which a student wants to solve a math problem. he will solve it in the following 4 steps:
step 1. brain receives instruction to solve a problem let suppose (1000+8000).
step 2. brain thinks and decides to multiply two numbers.
step 3. brain performs calculation 1000 + 7000= 8000
step 4. the result (8000) is stored in the memory.
to further explore the function of CPU, consider another example of log on On process of a computer. this also completes in the following four steps:
step 1: you enter username and password as an input.
step 2: computer thinks and decides to send the username and password to database for confirmation.
steps 3: computer does some work to match and confirm the username and password.
step 4: when username and password are confirmed from database computer opens the desktop as output.