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.
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