Chapter 6 : Inside Computer And Mobile Devices

1. Inside The Case of Dekstop and Laptop

Component	Function
- Motherboard	A computer chips contains integrated circuit
- Processor / Central Processing Unit (CPU)	Interprets and carries out the basic instructions that operate a computer Repeats a set of four basic operations, which consist of a machine cycle The leading manufacturers of personal computer processor chips are Intel and AMD
- Arithmetic Logic Unit (ALU)	Performs arithmetic, comparison, and other operations It represents the fundamental building block of the central processing unit (CPU) of a computer.
- Control Unit	The component of the processor that directs and coordinates most of the operations in the computer It tells the computer's memory, arithmetic/logic unit and input and output devices how to respond to a program's instructions.
- Heat Sinks - Liquid cooling technology - Cooling mats	Cooling the CPU / Devices

2. Cloud Computing

Refers to sharing resources, software, and information via a network, in this case the Internet. The information is stored on physical servers maintained and controlled by a cloud computing provider such as iCloud, Dropbox, Google Drive .

People always use it for:

• ·         Space Savings
• ·         Accessibility
• ·         Cost Saving
• ·         Scalability 

3. Data Representation.

•          Analog signals are continuous and vary in strength and quality

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

In the digital computer, data represent using binary system. 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
•         Eight bits grouped together as a unit are called a byte. A byte represents a single character in the computer or mobile device

4. Memory

•  Memory’s function is to store instructions waiting to be executed by the processor, data needed by those instructions, and the results of processing the data.
•   It store 3 basic categories items :

Ø  The operating system and other programs

Ø  Applications

Ø  Data being processed and the resulting information

•    Flash Memory - can be erased electronically and rewritten the data . Very useful when you need to transfer the data to another devices without using networking .
•    Access Time - the amount of time(nanoseconds) the processor takes to read from memory.
•    In memory, there is two system unit :

Volatile memory	Nonvolatile memory
Ø  Loses its contents when power is turned off Ø  Example includes RAM	Ø  Does not lose contents when power is removed Ø  Examples include ROM(memory chips storing permanent data and instructions), flash memory, and CMOS

5. Adapter

• An adapter is a physical device that allows one hardware or electronic interface to be adapted (accommodated without loss of function) to another hardware or electronic interface. In a computer, an adapter is often built into a card that can be inserted into a slot on the computer's motherboard.

Component	Function
Adapter card	Enhances functions of a component of a desktop or server system unit and/or provides connections to peripherals –      Sound card and graphics card –      Pendrive or projector
Expansion Slot	A socket on a desktop or server motherboard that can hold an adapter card
Plug and Play	Allow computer automatically recognize peripheral devices.

6. Power Supply and Battery

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

Power Supply (laptop AC adapter)	Battery
Converts the wall outlet AC power into DC power	Rechargeable lithium-ion batteries supply power to devices such as laptop and handphone