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Arithmetic Unit
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Logic unit
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Control Unit
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Main Memory
It performs arithmetic operations on data.The arithmetic operations are addition, subtraction, multiplication and division. Operations are usually performed by Arithmetic Unit. The multiplication and division operations are usually implemented by the arithmetic unit as the repetitive process of addition and subtraction operation respectively.
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It performs logical operations on the data. The various logical operations are >, <, =, !=, <<, >>, etc. Logic unit uses various logic gates like AND, OR, NAND, NOR,etc. for performing logical operations on data.
It controls the flow of data and information. It maintains the sequence of operations being performed by the C.P.U. It fetches and instructions from the storage area, decodes the instructions and transmits the corresponding signals to the arithmetic or logic unit and the storage registers. It guides the arithmetic and logic unit about the operations that are to be performed and also suggests the Input/Output devices to which the data is to be communicated.
It is also referred as Internal or Primary Memory and RAM. It is temporary memory, holds data only for short period of time. Once computer is switched off, the data stored in the RAM gets erased. That's why, it is also known as Volatile Memory.
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