the system unittttttttttttt

• The system unit is the main part of a microcomputer.
• Computer System Case covers and protects the inside components of the computer system.
• There are full tower, mini-tower, small form factor system case.
• Motherboard, Mainboard, System Board is the main circuit board of a computer.
• It contains all the circuits and components that run the computer.
• The processor, also known as Central Processing Unit (CPU), is the main “brain” or “heart” of a computer system.
• It performs all of the instructions and calculations that are needed and manages the flow of information through a computer.
• Primary storage, also known as internal storage, main memory or memory, is the computer's working storage space that holds data, instructions for processing and processed data (information) waiting to be sent to secondary storage.
• Physically, primary storage is a collection of RAM chips.
• There are two types of memory: ROM (Read Only Memory) and RAM (Random Access Memory).
• ROM is non-volatile, meaning it holds data even when the power is ON or OFF.
• RAM is volatile, meaning it holds data only when the power is on.
• RAM is volatile, meaning it holds data only when the power is on. When the power is off, its contents are lost.
• An expansion bus is a data pathway between several hardware components inside or outside a computer.
• Power Supply Unit (PSU) is installed in the back corner of the PC case, next to the motherboard.
• Hard Disk Drive (HDD), also known as hard drive, is a magnetic storage device that is installed inside the computer.
• The hard drive is used as permanent storage for data.
• An optical drive is a storage device that uses lasers to read data on the optical media.
• There are three types of optical drives: Compact Disc (CD), Digital Versatile Disc (DVD) and Blu-ray Disc (BD).
• Video card, also known as video adapter, graphics card, display adapter, is an expansion card that allows the computer system sends information specifically graphics or visual multimedia elements to an output device like monitor or LCD projector.
• Sound card enables the computer to produce sound through audio device.
• Network card, also known as Network Interface card (NIC), allows the computers to communicate with other devices.
• CPU Fan keeps the inside parts of the system unit to be cooled down.
• Power Supply Unit (PSU)
• The power supply unit converts 120vac (standard house power) into DC voltages that are used by other components in the PC.
• Sound card – This card enables the computer to produce sound through audio device.