Grade 9 Quarter 2

1. COMPUTER SYSTEM
SERVICING

2. OBJECTIVES 1. Discuss the types of
components and objects to be
measured;
2. Identify the name of
components and its measurement;
and
3. Appreciate the importance of
knowing the components and
objects to be measured.

3. RECAP
1. What was our lesson
yesterday?
2. What have you learned
from our previous lesson?

6. TYPES OF COMPONENTS &
OBJECTS TO BE MEASURED

13. Think of this!
1. What do you think of the computer
components mentioned earlier—can they
be measured?
2. If they can be measured, what are we
measuring with these components?
3. Based on what you’ve understood about our
activity, do these computer components
have an impact on the performance of the
computer?
4. Will you cite an example that might affect
the computer?

14. Think of this!
1. What do you think of the computer
components mentioned earlier—can they
be measured?
2. If they can be measured, what are we
measuring with these components?
3. Based on what you’ve understood about our
activity, do these computer components
have an impact on the performance of the
computer?
4. Will you cite an example that might affect
the computer?

15. MENSURATION
Mensuration refers to the process of measuring the computer components
and objects to fully understand the needed requirements and capacity.
The results of measurements taken are the calculations that are usually
considered in building a computer.

16. MEMORY is the working storage space of the computer
which holds data, processing instructions, and
processed data (information) waiting to send in
secondary storage.

17. TWO TYPES OF MEMORY
Random Access Memory (RAM) -is the
computer's portion that temporarily stores
the computer's running instructions and
the data it handles.
RAM data is volatile. If the power of the
machine is switch off, all data will be
erased and become lost. The RAM can
carry millions of bytes of data, so the
capacity is calculated based on
Megabytes (MB)1,000,000 or 1 million
bytes and Gigabytes (GB) 1,000,000,000
or 1 billion bytes.
Read Only Memory (ROM) -is a type of
non-volatile memory used in computers
and other electronic devices. Data stored
in ROM cannot be electronically changed
after the manufacture of the memory
device.Read-only memory is beneficial for
storing software that is rarely changed
during the life of the system, also known
as firmware.

18. DATA
STORAGE
CAPACITY
refers to how much disk space one or more
storage devices provides. It measures the
capacity of data on a computer system. The
storage capacity is measured in Kilobytes (KB),
Megabytes (MB), Gigabytes (GB) and terabytes
(TB). For example, a computer with a 500GB
hard drive has a storage capacity of 500
gigabytes or 5 billion bytes.

19. MAGNETIC
STORAGE
MEDIA &
DEVICES
stores data in a form of tiny
magnetized dots. These
dots are formed, read and
erased by very tiny
electromagnets using
magnetic films.
is a kind of computer disk drive
that reads and writes data from
optical disks through laser
beaming technology. This kind
of drive allows a user to
retrieve, modify and delete the
content from optical disks such
as CDs, DVDs and Blu-ray
disks. Optical drives are one
the most common computer
components.
is a storage device that has
no moving parts no reels of
tape, no spinning discs, and
no laser beams.
Solid-state storage devices
store data using a special
memory type known as flash
memory.
OPTICAL
STORAGE
DEVICE
SOLID STATE
STORAGE

20. DIFFERENT KINDS OF MAGNETIC STORAGE MEDIA:

21. DIFFERENT KINDS OF MAGNETIC STORAGE MEDIA:

22. DIFFERENT TYPES OF OPTICAL STORAGE DEVICE:

23. DIFFERENT TYPES OF OPTICAL STORAGE DEVICE:

24. EXAMPLES OF SOLID-STATE STORAGE DEVICES:

25. PROCESSOR is also called the CPU or central processing unit which is
considered as the computer's 'brain. It is a piece of hardware
that carries out the instructions of a computer program. It
performs the basic arithmetical, logical, and input/output
operations of a computer system. It gives the device the
software instruction. The CPU can be found in the computer's
internal circuit board called the motherboard.
The speed at which the CPU can execute the instructions is
called the clock speed. This is controlled by a clock. With
every tick of the clock, the CPU fetches and executes one
instruction. The clock speed is measured in cycles per
second, and one cycle per second is known as 1 hertz. This
means that a CPU with a clock speed of 2 gigahertz (GHz)
can carry out two thousand million (or two billion) cycles per
second.

26. VIDEO
CARD
is also called as graphics cards, video adapters, display cards,
graphic adapters and graphic accelerators. It is a computer
component that is used to enhance the quality of images
showed on a display. It is attached to the motherboard which
controls and calculates the appearance of an image on the
screen. The video card is an intermediate device that
accelerates the video output. A graphics card's processor is
called a graphics processing unit or GPU.
The card’s performance is measured in its frame rate which is
calculated in frames per second (FPS). The frame rate shows
how many complete images the card can display per second.
The human eye can process about 25 frames every second,
but fast-action games require a frame rate of at least 60 FPS
to provide smooth animation and scrolling.

28. “The true measure of a man is how he treats someone
who can do him absolutely no good”.
- Samuel Johnson

29. IDENTIFICATION: Identify the following sentence. Write your answer
on the space provided before the number.
___________________1. The computer disk drive that uses laser beam technology to read and
write data from optical disks.
___________________2. This is volatile; it temporarily stores the computer's running
Instructions and the data it handles.
___________________3. A storage device used for storing media and data files.
___________________4. It is a piece of hardware that carries out the instructions of a computer
program.
___________________5. It is called as graphics cards, video adapters, display cards, graphic
adapters, and graphic accelerators.