CPU

CPU                                           Central Processing Unit                                          (The Brain of Computer)

The CPU is the control center for a computer. It guides, directs & governs its performance. It is the brain of the computer. 

CPU CONTAINS :

1. Arithmetic & Logical Unit

2. Control Unit

ARITHMETIC & LOGICAL UNIT

An Arithmetic and Logical Unit (ALU) is a digital circuit  that performs arithmetic and logical operations. The ALU is a fundamental building block of the central processing unit (CPU) of a computer. ALU is a combination of Arithmetic Unit & Logical Unit.

ARITHMETIC UNIT

Arithmetic Unit performs all the arithmetic operations like addition , subtraction , multiplication & division performed on the operands.

For example :

a + b

a - b

a * B

a / b

CONTROL UNIT

Control Unit is most important part which controls all the internal as well as external functions in the computer. 

THE MAIN FUNCTIONS PERFORMED BY THE CONTROL UNIT ARE :

1. It controls & guides the interpretation , flow    & manipulation of all data & information.

2. It sends control signals until the required operations are done properly by ALU & memory.

3. It gets program instructions from memory & executes them one after another.

4. It controls the flow of data from input device to memory & from memory to output devices.