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1.1 What Is a Computer? 

Objectives:

At the end of the lesson 85% of the students are expected to:

2. Enumerate the (6) six logical units of a computer.

1. know the definitions of computers, computer programmers,

hardware and software.

3. Differentiate the logical units.

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1.2 What Is a Computer? 

is a device capable of performing computations

and making logical decisions at speeds millions

and even billions of times faster than those of 

human beings.

A computer -

can perform hundreds of billions of additions

per second—about as many calculations as

hundreds of thousands of people couldperform in one year!

Supercomputers -

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Computer programs - are controlled sets of instructions in

which computers process data.

Computer programmers - are individuals that make computer

programs to work correctly and

can be useful in the society.

Hardware -are the physical devices of a

computer that can be seen and

touch.

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Examples of Computer Hardware:

System Unit CRT Monitor LCD Monitor

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Examples of Computer Hardware:

Keyboard Mouse Printer

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Software -the program that run on a computer.

Examples of software's 

1. Windows2. Adobe

3. Visual Studio

4. Red Hat Linux

5. Microsoft Office

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6 Logical Units or Sections of a Computer

1. Input unit.

2. Output unit.

3. Memory unit.

4. Arithmetic and logic unit (ALU)

5. Central processing unit (CPU)

6. Secondary storage unit

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1. Input unit -

2. Output unit - this “shipping” section of the computer 

takes information that the computerhas processed and places it on

various output devices, making the

information available for use outside

the computer.

this “receiving” section of the computer 

obtains information (data andcomputer programs) from various input

devices. The input unit then places this

information at the disposal of the other

units to facilitate the processing of theinformation.

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3. Memory unit -

4. Arithmetic and logic unit -

(ALU)

5. Central processing unit -

(CPU)

this is the rapid-access, relatively low-

capacity “warehouse” section of the 

computer, which facilitates thetemporary storage of data.

is the “manufacturing” section of 

the computer. It is responsible forthe performance of calculations such

as addition, subtraction, multiplication

and division.

serves as the “administrative”

section of the computer. This is the

computer’s coordinator, responsible 

for supervising the operation of the

other sections.

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6. Secondary storage unit -is the long-term, high- capacity

“warehousing” section of the

computer.