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What are the many ways that you use computers today?

Reasons for taking this course

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Scope of this Course

• Computer Hardware• Computer Software• Email• MS Word, Excel, Powerpoint• Internet• File Management• MS PowerPoint• MS Excel

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Definition of the Computer

How is a computer defined?

Electronic machine operating under the control of instructions stored in its own memory

• Accepts data

• Manipulates data

• Produces results

• Stores results

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What does it consists of ?

SoftwareInstructions that

tell hardware how to perform tasks

HardwarePhysical Equipment

(Electronic and mechanical equipment)

Definition of the Computer

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Parts of the ComputerWhat are the input components?

scanner

microphone keyboardPC camera

digital camera

• Hardware used to enter data and instructions Turns information into a series of electronic pulses that the

computer can understand.

mouse

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Parts of the ComputerWhat are the output components?• Hardware that conveys information to a user The series of electronic pulses are passed from the CPU and turned into

something that we can see and/or hear through the output devices.

printer

monitor speakers

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processor

(RAM) memory modules

Parts of the ComputerWhere is the CPU or Central Processing Unit?It is contained in the systems unit.

Box-like device containing electronic components connected to motherboard.

Systems Unit

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processor

hard disk

CD or DVD drive

(RAM) memory modules

USB drive

Brains of the Computer!

Parts of the ComputerWhat is the CPU or Central Processing Unit?Hardware used to process the data & instructions.

Carries out instructions that tells the computer what to do

sound card

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Parts of the ComputerData is Stored in Two ways:

Memory:

Permanent = Hard

Disks, USB keys, CDs

RAM = Random Access Memory

ROM = Read Only Memory

RAM is fast, but it is expensive, and when you turn the power off….poof!

RAM = You cannot write to it or change it.

Storage is the cheapest, but it is slower.

Storage:Stores the information being used by the computer while it is turned on.

Stores information that may be used again later.

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What is a hard disk?

• Provides much greater storage capacity than a CD, DVD or Flash Memory Key

• Reads and writes information on non-removable disks.

• Holds a great deal of information (e.g., many gigabytes GB).

removable hard disk

self-contained hard disk

p. 1.7 Fig. 1-6 & 7

Next

Parts of the ComputerExternal memory or storage

KB = exactly 1,024 bytesMB = one million bytesGB = one billion bytes (1000 MB)

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What is a CD or DVD?

Portable storage media

Compact Disks:

– CD-R (Recordable)

– CD-RW (Rewritable)

Digital Video Discs:

– DVD-ROM (Read Only Memory)

– DVD+RW (Rewritable)

p. 1.8 Fig. 1-8

Next

Parts of the ComputerExternal memory or storage

13p. 7.19 Fig. 7-26

How do you care for a compact disc?

Next

1: Do not expose to excessive heat or sunlight

2: Do not eat, smoke, or drink near a disc

3: Do not stack

4: Do not touch underside

5: Store in jewel box when not in use

6: Hold disc by its edges

Parts of the Computer

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Parts of the Computer

How does a USB key store information? It uses electically erasable programmable read-only memory or EEPROM chips. These

chips retain data even when there is no power to the chip.

External memory or storage

The EEPROM The EEPROM chip is on the chip is on the other side of the other side of the circuit board.circuit board.

The controller chip is The controller chip is the “brain” that the “brain” that controls the reading controls the reading and writing of the and writing of the data.data.