Page 19 - Viva ICSE Computer Studies 7 : E-book

7. Ethernet Port
Ethernet port resides on an ethernet card. Data travels
at 10 megabits to 1000 megabits per second depending
upon the network bandwidth.
Use: It connects the network cable to a computer.
It connects to a network and high speed Internet.

External Hardware
External hardware are also called peripherals. The devices attached to the computer externally
are called external hardware. Input devices, output devices and storage devices are examples
of external hardware.

Input Devices

Input devices feed information, data and instructions to a computer. The computer accepts
and processes them before giving the output. Let’s learn about some common input devices.

Keyboard

Keyboard, the most common and essential input device of a computer is similar to a typewriter.
However, there are more keys present on a computer keyboard than on a typewriter. The most
commonly used keyboard (QWERTY keyboard) has 105 keys.
A keyboard consists of fi ve types of keys.
• Typing keys: They consist of alphabet keys (A–Z), number keys (0–9), punctuation keys
(?, >, <, etc.) and special symbols keys (&, #, etc.). These keys also include Caps Lock, Shift,
Backspace, Enter, Spacebar and Tab keys.

• Control keys: They can either be used alone or in combination with other keys to perform
an action. Ctrl, Alt and Esc are some control keys.
• Function keys: There are 12 keys that are present at the top row of the keyboard and are
used to perform specifi c tasks. F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11 and F12 are the
function keys.

• Navigation keys: They are used to move through the document. Home, Insert, End and
Arrow keys are the navigation keys.
• Numeric keypad: It is placed at the Learn More
right side of the keyboard. It consists of A QWERTY keyboard is so called as in this
number key 0–9, arithmetic operators type of a keyboard the leftmost six letters in
and the decimal point. the topmost row are Q, W, E, R, T and Y.

Mouse
A mouse is a pointing device which is used to point out the location where you want to enter
the information. It is basically used to move the cursor, draw sketches/diagrams and select
items visible on the screen.

There are mainly three types of mouse: mechanical, optomechanical and optical.

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