1. Introduction to Computers

2. Chapter 1 - Introduction to Computer
Objectives
Learn Basic Computer Terminology
Differentiate Between Hardware and Software
Understanding Computer Components
Chapter 1 - Introduction to Computer

3. Chapter 1 - Introduction to Computer
In the beginning…
Chapter 1 - Introduction to Computer

4. Chapter 1 - Introduction to Computer
What is a computer?
An electronic device, operating under the control of instructions (software) stored in its own memory unit, that can accept data (input), manipulate data (process), and produce information (output) from the processing
To describe a collection of devices that function together as a system
Chapter 1 - Introduction to Computer

5. Different Types of Computers
Desktop
Lap Top
Hand Held
Chapter 1 - Introduction to Computer

6. Devices that comprise a computer system
Speaker (output)
Monitor (output)
“THE BOX”
Printer (output)
Scanner (input)
Storage devices
(CD-RW, Floppy, Hard disk, zip,…)
Keyboard (input)
Mouse (input)
Chapter 1 - Introduction to Computer

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Inside “THE BOX”…
Chapter 1 - Introduction to Computer

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Motherboard
This is where most of the electronics is located
Chapter 1 - Introduction to Computer

9. Central Processing Unit (CPU)
Chapter 1 - Introduction to Computer

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Brains of a computer
Contains electronic circuits that cause processing to occur
Interprets instructions to the computer, performs the logical and arithmetic processing operations, and causes the input and output operations to occur
Chapter 1 - Introduction to Computer

11. Modem (Modulator Demodulator)
Use for internet access with phone line
Chapter 1 - Introduction to Computer

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Audio Card
This is the voice of your system
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Network Card
Used to connect to high speed internet access e.g. Cable or DSL lines
Chapter 1 - Introduction to Computer

14. Single Inline Memory Module (SIMM)
Chapter 1 - Introduction to Computer

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Hard Disk Drive (HDD)
Chapter 1 - Introduction to Computer

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Hard Disk Drive
Computers main, long term storage.
It is referred to as non-volatile storage, because it does not disappear when the power is turned off.
The size of the Hard Drive is measured in Gigabytes. (Billions of Bytes).
Chapter 1 - Introduction to Computer

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Power Supply
250 – 500 Watts
This is the power source that makes everything go
Chapter 1 - Introduction to Computer

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What Does A Computer Do?
Computers can perform four general operations, which comprise the information processing cycle.
Input
Process
Output
Storage
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Computer Tools
Two kinds:
Hardware
Physical parts to computer (can be touched)
Software
The programs that are on the disks
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Examples of Hardware
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Computer Storage
Two main types:
Memory
Data Storage
Chapter 1 - Introduction to Computer

22. Random Access Memory (RAM)
RAM is the memory used by the computer to run programs.
The amount of RAM available will run and how many windows can be open at one time.
Volatile
Disappears is turned off
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Data Storage
Information stored away for use later on
(like food in the refrigerator)
Usually long-term (safer)
May be stored on disks, CDs. DVDs, or flash drives
Chapter 1 - Introduction to Computer

24. Measuring Information
Bytes
One character takes up about one Byte.
An takes up a few (thousand bytes) Kilobytes (thousands of bytes)
A picture may take up Megabytes (millions of bytes)
All the information on a computer may run into Gigabytes (billions of bytes)
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Storage Examples
, about a thousand characters
Picture of granddaughter, about half a megabyte
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Floppy Disk
Portable, inexpensive storage medium that consists of a thin, circular, flexible plastic disk with a magnetic coating enclosed in a square-shaped plastic shell
Main disk used for library users
Holds 1.44 Megabytes
1,440,000 Bytes
Feels hard
Floppy part inside cover
Almost obsolete
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Zip Disk
Similar to floppy
Thicker form
Holds more information
Available on some library computers
Also becoming obsolete
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Compact Disks
Also called an optical disc, is a flat round, portable storage medium that is usually 4.75 inch in diameter.
A CD-ROM (read only memory)
Used the same laser technology as audio CDs for recording music.
Can contain other types of data such as text, graphics, and video.
The capacity is 650 MB of data.
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DVD
Replacing CD-ROM
Holds much larger amount of information (such as movie)
Also does not work on library computers
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Flash Drive
Most recent widely used storage system
Very portable, often worn like jewelry
Megabytes most common sizes
Chapter 1 - Introduction to Computer

31. TIME FOR A STRETCH BREAK