Chapter 6

Inside Computer & Mobile Devices


INSIDE THE CASE


The case contains and protects the electronics of the computer or mobile device from damage.

The motherboard is the main circuit board of the computer.

- A computer chip contains integrated circuits.

PROCESSOR

Also called the central processing unit (CPU).

- interprets and carries out the basic instructions that operate a computer.

- Contain a control unit and an arithmetic logic unit (ALU).

A multi-core processor is a single chip with two or more separate processor cores.

- 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 leading manufacturers of personal computer processor chips are :

a) Intel

b) AMD 

CLOUD COMPUTING

Home and business users choose cloud computing for a variety of reasons :

a) Accessibility

b) Cost savings

c) Space savings

d) Scalability

DATA REPRESENTATION

a) Analog signals are continuous and vary in strength and quality.

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

- Most computers are digital. The binary system uses two unique digits (0 and 1).

- The circuitry in a computer or mobile device represents the on or the off states electronically by the presence or absence of an electronic charge.

MEMORY

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.

- The system unit contains two types of memory:

a) Volatile Memory - Loses it content when power is turned off.

b) Non-volatile Memory - Do not loses it content even the power is turned off.

ADAPTERS

- An adapter card enhances functions of a component of a desktop or 

server system unit and/or provides connections to peripherals.

eg: Sound card and graphics card

- An expansion slot is a socket on a desktop or server motherboard

 that can hold an adapter card.

Example of adapter cards are :

POWER SUPPLY & BATTERY

- The power supply or laptop AC adapter converts the wall outlet AC power into DC power.

- Mobile computers and devices can run using either a power supply or batteries.

- Batteries typically are rechargeable lithium-ion batteries.

 a) Power supply 

b) Mobile phone battery

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