Identification of externally visible computer components

 

1. Identification of externally visible computer components .

Ex. No.1

Date: 07.08.2023

AIM: Identification of externally visible computer components

 

PROCEDURE:

1)   Look at the computer and its macro-components. Identify the following components:

a.    Central Processing Unit (CPU)

b.    Monitor (Light Emitting Diode LED/ Liquid Crystal Display LCD/ Cathode Ray Tube CRT) – size 10”, 15.6”, 20”, etc. diagonal size.

c.    Mouse – Left, right and centre buttons. Centre button is a roller.

d.    Keyboard – 107 keys; US International layout.

e.    Power button of CPU.

f.     Reset button of CPU.

 

2)   Look at the back panel of the Central Processing Unit. Identify the following components:

 

a.    Personal System/2 (PS/2) port – for keyboard and mouse – 2 ports

b.    Universal Serial Bus (USB) – version 2 or 3 (USB2 or USB3).

c.    Recommended Standard 232 (RS-232) or Serial Port or COM port

– for duplex communication. Previously used for mouse, MODEM, etc. It has 9 pins arranged in 2 rows (5+4 pins)

d.    Line Print Terminal (LPT) or Parallel Port or Centronics 36 port – for old type printers.

e.    Video Graphics Array (VGA) port – for monitor; It connects to DE- 15 connector. 15 pins are arranged in 3 rows of 5 pins each.

f.     Registered Jack 45 (RJ45) or Ethernet port or LAN port – For broadband or Local Area Network (LAN) connection.

g.    Registered Jack 11 (RJ11) – Similar in shape to RJ45 but smaller in size. Used for connecting telephone line or other communication lines.

h.    Digital Visual Interface (DVI) – Video output port for monitor.

i.      Audio input/ output jacks – 3 numbers

i.    Microphone Jack (3.5mm) - Left side port of the 3 jacks of 3.5mmm size.

ii.    Audio Output Jack (3.5mm) – Centre port of the 3 jacks of 3.5mmm size.

iii.    Line Input Jack (3.5mm) – Jack for input of audio signal from a device like radio.

j.      High Definition Media Interface (HDMI) port – for high quality video signal output for monitor, projector, etc.

k.    Game Port – For connecting Joystick.

3)   Identify the following buttons in mouse:

a.    Left button

b.    Right button

c.    Centre button cum scroll button

4)   Identify the following Special buttons on Keyboard:

a.    Space bar – The longest button at the bottom centre of keyboard.

b.    Ctrl (Control) – Placed on both ends of keyboard.

c.    Alt (Meta) – Placed on both ends of space bar.

d.    Shift – Placed at both ends of keyboard. It toggles Capital letter and helps to type symbols above numbers.

e.    Enter – Placed at right end of primary group and at the bottom of number lock.

f.     Caps lock – Toggles capital letters on or off.

g.    Tab – Inserts a tab character.

h.   Left, Right, Up and Down arrows - Between primary key group and number lock.

i.    Insert, Delete, Home, End, Page Up & Page Down – Placed above arrow keys.

j.    Print Screen, Scroll Lock & Pause/Break – Placed at the top right of keyboard.

k.   Function keys F1 to F12 – 12 function keys are placed at topmost row of keyboard.

l. Esc – Placed at the top left of keyboard.