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The Components of The System Unit by Mind Map: The Components of The System Unit
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The Components of The System Unit

is a case that contains electronic components of the computer used to process data

The System Unit

Drive Bay(s)

Power supply

Sound card

Video card




The processor, also called the central processing unit (CPU)

The control unit is the component of the processor that directs and coordinates most of the operations in the computer

The arithmetic logic unit (ALU) performs arithmetic, comparison, and other operations

The processor contains registers, that temporarily hold data and instructions

The system clock controls the timing of all computer operations

A processor chip generates heat that could cause the chip to burn up

Require additional cooling

Data Representation

Analog signals are continuous and vary in strength and quality

Digital signals are in one of two states: on or off


Memory consists of electronic components that store instructions waiting to be executed by the processor, data needed by those instructions, and the results of processing the data

Stores three basic categories of items

Each location in memory has an address

Memory size is measured in kilobytes (KB or K), megabytes (MB), gigabytes (GB), or terabytes (TB)

The system unit contains two types of memory

Read-only memory (ROM) refers to memory chips storing permanent data and instructions

Memory cache speeds the processes of the computer because it stores frequently used instructions and data

A PROM (programmable read-only memory) chip is a blank ROM chip that can be written to permanently

Access time is the amount of time it takes the processor to read from memory

Expansion Slots and Adapter Cards

An expansion slot is a socket on the motherboard that can hold an adapter card

An adapter card enhances functions of a component of the system unit and/or provides connections to peripherals

With Plug and Play, the computer automatically can configure adapter cards and other peripherals as you install them

Removable flash memory includes

Ports and Connectors

A port is the point at which a peripheral attaches to or communicates with a system unit (sometimes referred to as a jack)

A connector joins a cable to a port

A USB port can connect up to 127 different peripherals together with a single connector

Other types of ports include


A bus allows the various devices both inside and attached to the system unit to communicate with each other

Word size is the number of bits the processor can interpret and execute at a given time

Expansion slots connect to expansion buses

Common types of expansion buses include


A bay is an opening inside the system unit in which you can install additional equipment

Power Supply

The power supply converts the wall outlet AC power into DC power

Some external peripherals have an AC adapter, which is an external power supply

Keeping Your Computer or Mobile Device Clean

Clean your computer or mobile device once or twice a year

Turn off and unplug your computer or mobile device before cleaning it

Use compressed air to blow away dust

Use an antistatic wipe to clean the exterior of the case and a cleaning solution and soft cloth to clean the screen

Putting It All Together


Small Office/ Home Office