1 Computer Hardware Foundations
Learn the roles of computer components and peripherals, how they work together, and how to handle hardware safely.
The computer system
A computer system combines input, processing, memory, , and output. Hardware components communicate through the and receive electrical power from the power supply. Each part has a distinct role, and many tasks depend on the parts working together.
Processing and active memory
The executes program instructions and processes data. A may have multiple cores, allowing it to work on multiple tasks at once. It fits into a compatible socket and usually needs a heatsink and fan to remove heat.
holds the data and instructions the is actively using. It is fast but temporary: its contents are normally lost when the computer is turned off. For example, a document may be stored on a drive, loaded into while it is edited, and processed by the as the user types.
Persistent
keeps files and programs when the computer is off. It is generally larger and persistent, while is the computer’s active workspace.
Two devices are a hard disk drive () and a solid-state drive (). An stores data on rotating magnetic disks. An stores data in flash memory and has no spinning disks.
Connections and power
The is the main circuit board. It provides the socket, memory slots, connectors, and pathways that let components exchange data. It also constrains compatibility: the , , drive, and other parts must match its supported sockets, standards, and connections.
The power supply unit () converts power from a wall outlet into the regulated voltages computer components require, then supplies them through cables. Its connectors must match the system’s components. Never open a ; internal parts can retain hazardous electrical energy.
Graphics and cooling
A graphics processing unit () creates images for a display. Graphics hardware may be built into the or installed as an expansion card on the .
Fans, heatsinks, and vents move heat away from components. Keep vents clear and make sure fans can spin freely.
Peripherals and printers
A is a device connected to a computer to provide input, output, or additional functions. Examples include keyboards, mice, monitors, webcams, microphones, speakers, scanners, external drives, and network adapters. Peripherals connect through ports such as USB, display, audio, or network connections, or through wireless links.
A is an output device. An inkjet places tiny droplets of liquid ink on paper. A laser uses toner powder and heat to form an image on paper. Many multifunction printers can also scan, copy, or send and receive documents. Follow the model’s instructions when clearing jams or replacing supplies; laser- fusers can become hot during use.
How components work together
When a saved file is opened, the computer reads it from into . The processes instructions and data from ; the provides communication paths, and the supplies electrical power. Graphics hardware sends image data to the monitor. A keyboard or mouse supplies input, while speakers or a can provide output.
When printing a page, the computer loads the document and instructions, processes them, and sends the resulting print data to the . The then uses ink or toner to put the page on paper. Each part has a distinct role, but the task depends on them working together.
Safe handling
Before opening a computer or installing internal parts, shut it down and disconnect power. Disconnect attached power sources and follow the device’s service instructions. Do not work inside powered equipment.
Reduce electrostatic discharge (). Use a grounded antistatic wrist strap and work surface when available, and keep replacement parts in antistatic packaging until needed. Handle components by their edges; avoid touching circuit traces, connector contacts, pins, or exposed chips. Place parts on an antistatic surface, not on carpet or loose packaging.
Check alignment and compatibility before installing a part. Work gently and do not force connectors, memory modules, or expansion cards; consult the device manual if a part does not fit. Keep liquids, loose metal, and tools away from powered equipment. Inspect power cords and plugs, and do not use damaged equipment.
Follow -specific precautions. Turn off and unplug a before reaching inside when its instructions require it. Allow hot parts, especially a laser ’s fuser, to cool. Do not disassemble the or components that the manufacturer designates for service technicians.
Identifying hardware by role
Identify each item by its main role:
: Executes instructions and processes data.
module: Temporarily holds active data and instructions.
or : Stores files and programs persistently.
: Connects components and enables communication.
: Supplies regulated electrical power.
Keyboard or mouse: Provides input.
Monitor, speakers, or : Provides output.