definition of HARDWARE? classification of hardware?

 . HARDWARE 

- ALL THE PHYSICAL COMPONENT THAT GROUPED TOGETHER  AND FORM A COMPLETE SYSTEM KNOWN A HARDWARE E.G MOTHER BOARD RAM, ROM, HARD DISK, MONITOR, KEYBOARD, MOUSE,ETC . 

. CLASSIFICATION OF HARDWARE

- HARDWARE IS DIVIDED INTO  THREE PARTS,

(i) CONTROL PROCESSING UNIT (CPU)

(ii) MEMORY UNIT

(iii) PERIPHERALS  DEVICE 

- CENTRAL PROCESSING UNIT (CPU)

 

-  CENTRAL PROCESSING UNIT IS CALLED THE BRAIN OF COMPUTER SYSTEM. IT IS ALSO KNOWN AS MICRO PROCESSOR WHEN IT IS CONSTRUCTED ON A SINGE CHIP. ARITHMETIC LOGIC AND CONTROL UNIT ALONG WITH REGISTERS FORM A COMPLETE CENTRAL PROCESSING UNIT AND CENTRAL PROCESSING UNIT ALONG WITH INPUT/ OUTPUT. UNIT AND MEMORY UNIT FORM A COMPUTER SYSTEM.

.MICROPROCESSOR- MICROPROCESSOR PROCESS THE INSTRUCTION. THE MICRO PROCESSOR IS MADE OF MILLIONES OF TRANSISTERS. THERE ARE TINY ELECTRONICS

DEVICES. THAT CARRY AN ELECTRIC CHARGE. 

.CONTROL UNIT -     CONTROL UNIT CONTROL THE FLOE OF INFORMATION WITHIN THE

COMPUTER SYSTEM. CONTROL UNIT IN-CHARGE OF COMPUTER.

.ALU(ARITHMETIC LOGIC UNIT);- AN ARITHMETIC LOGIC UNIT (ALU) PERFORMS ARITHMETIC AND LOGIC OPERATIONS.

. MAIN MEMORY UNIT - MAIN MEMORY UNIT KNOWN AS MAIN MEMORY  OR PRIMARY MEMORY. MEMORY UNITS IS A INTERNAL MEMORY.

. PRIMARY MEMORY

- RAM- RANDOM ACCESS MEMORY

-STATICS

-DYNAMIC-SD CARD

-ROM- READ ONLY MEMORY

-PROM - PROGAMMABLE  - ROM

-EPROM- ERASABLE - PROM

-EEPROM- ELECTIRAL EPROM

. SECONDARY  MEMORY

- MAGNETIC TAPE

- OPTICAL DARK

- MAGNETIC DISK

     CD- (COMPACT DISK)

. PRIMARY MEMORY

- RAM ( RANDOM ACCESS MEMORY)- IT IS KNOWN AS READ WRITE MEMORY, THAT ALLOWS . CPU TO READ AS WELL AS WRITE DATA INSTRUCTION INTOIT. RAM IS USED FOR THE TEMPORARY STORAGE OF INPUT DATA, OUTPUT DATA, AND INTERNAL  RESULTS.

. ROM( READ ONLY MEMORY)-IT IS ALSO KNOWN AS NON- VOLATILE 

MEMORY OR PERMANENT STORAGE , IT DOES NOT LOSE ITS CONTENT WHEN THE POWER IS SWITCHED OF ROM HAS ONLY READ CAPABILITY, NO WRITE CAPABILITY.

.PERIPHERALS DEVICE-

- AUXILIARY, EQUIPMENT USED IN COMPUTER LIKE INPUT DEVICE, STORAGE DEVICE,

 COMMUNICATION DEVICE OR OTHER DEVICE FUNCTION UNDER THE DIRECT CONTROL OF A COMPUTER.

(i) INPUT DEVICE

(ii) OUTPUT DEVICE

(iii) STORAGE DEVICE