What are the Various parts of Computers
HARDWARE – The physical equipments and components which we can touch and feel in a computer system is called hardware. The parts of computer hardware are
1. The system unit or The central processing unit.
2. The Moniter/Printer or Output Devices
3. The Keyboard/Mouse or Input Devices.
4. The Floppy Drive or Storage Devices.
5. The Hard disk drive – Memory or storage devices
Central Processing Unit – The CPU is the brain of the computer, it controls and executes the commands of the computer. It also controls the flow of information through the system. It directs the computer to store information in its memory and retrieving it when needed. The CPU further consists of 3 units
1. Control Unit
2. Arithmetic and Logic Unit (ALU)
3. Memory Units
Control Units- The control unit acts as a coordinates among different systems of the computer. It controls and co-ordinates the activities of all other units. It can get instruction out of the memory unit. The control unit does not execute instructions itself, it tells other parts of the computer what to do. It controls the flow of electronic signals between the main memory and ALU. It interprets the instructions coming from the memory unit nad issues necessary signals to other computer system component to give satisfied information.
ALU – This unit performs all the arithmetic and logical functions, it divides, adds, subtracts etc. and compares the data. This unit controls the speed of calculation. Without the ALU we should have not been able to do useful tasks.
Memory – This unit acts as a buffer between the CPU and rest of the components. It stores data and retrives it whenever neede. Memory is of two types
RAM – Random Access Memory
ROM – Read Only Memory
Ram – This is also called temporary memory because it goes off when we switch off the computer. It is also called as volatile memory. As the name (RAM) suggest data can be stored and retrived at random. As RAM is temporary important information is stored onto non volatile secondary storage devices such as diskettes or hard disks. Different computers have different RAMs and as 512 KB, 640 KB, 1 MB
512 KB = 512 Kilo bytes
640 KB = 640 “
1 MB = 1 Mega bytes
1 bit – One character
8 bits = 1 byte
1024 Bytes = 1 KB
1024 KB = 1 MB
A bit is the smallest piece of information that a computer can hold.