Computer hardware

Question 1

what is an input device?

Answer 1

An input device is a piece of hardware used to provide data to a computer used for interaction and control. It allows input of raw data to the computer for processing.

Question 2

input devices examples

Answer 2

keyboard, mouse, scanner, sensors, microphone, barcode reader

Question 3

what is an output device?

Answer 3

devices that allow the computer system to provide information, data or instructions to another user

Question 4

Infrared touch screen?

Answer 4

IR emitters send out infrared light which is received by the other side of the screen by a IR receiver. If screen is touched, light is scattered and the receiver records less intense light. Maths equations locate the touch.

Question 5

Resistive touch screen?

Answer 5

Coated with a thin metallic electrically conductive and resistive layer that causes a change in the electrical current which is registered as a touch event and sent to the controller for processing.

Question 6

Capacitive touch screen?

Answer 6

Capacitive screens are made up of layers of glass and plastic, coated with a conductor material like copper. When you touch your screen, an electric circuit is completed at the point where your finger makes contact, changing the electrical charge at this location.

Question 7

Output devices examples

Answer 7

plotters, speakers, headphones, braille terminal

Question 8

what is a communication device?

Answer 8

these devices allow one computer device to communicate with another

Question 9

modem purpose

Answer 9

modem, is a hardware device that converts data from a digital format, intended for communication directly between devices with specialized wiring, into one suitable for a transmission medium such as telephone lines or radio.

Question 10

network interface card purpose

Answer 10

NIC allows both wired and wireless communications. NIC allows communications between computers connected via local area network (LAN) as well as communications over large-scale network through Internet Protocol (IP).

Question 11

terminal adapter purpose

Answer 11

A terminal adapter (TA) is a device that connects a computer to an integrated services digital network (ISDN). The terminal adapter transmits digital data directly from the computer to the ISDN line without having to modulate and demodulate between digital signals.

Question 12

wireless router purpose

Answer 12

converts internet signal into a wireless signal which other devices in the network can use to communicate with each other and the router

Question 13

wireless network cards purpose

Answer 13

the means by which the computer and devices are able to receive and send wireless communication

Question 14

Hub

Answer 14

allows many computers to communicate over a network. A USB hub allows multiple peripherals to connect through a single USB port

Question 15

modem advantages

Answer 15

• large files can download quickly
• offers high internet speeds
• you don’t need to connect to a cable to use the internet

Question 16

modem disadvantages

Answer 16

• internet speed can slow down if many people are using it
• connections aren’t available in all religions
• to use a modem you need to pay highly every month

Question 17

network interface card advantages

Answer 17

• provides a fast connection to the internet
• provide a reliable connection to the Internet that
  should not vary in performance or availability
• allows us to share bulk data among many users

Question 18

network interface card disadvantages

Answer 18

• security is minimal low
• the information is unstable
• the design should be legitimate for better
  correspondence

Question 19

terminal adapter advantages

Answer 19

• there are no wires so less mess
• you can connect multiple devices at once
• they allow computer users to troubleshoot network issues easily

Question 20

terminal adapter disadvantages

Answer 20

• very expensive

* require special digital services

Question 21

wireless router advantages

Answer 21

• users are able to share files with others
• no cables are needed so save time and cost
• if a cafe has a wireless router it will attract more
  customers

Question 22

wireless router disadvantages

Answer 22

• can be obstructed by everyday objects at home
• its much slower than a wired one
• have an increased chance of jamming and interference due to external factors

Question 23

wireless network cards advantages

Answer 23

• very easy to operate and change
• great security
• so much cheaper than wired

Question 24

wireless network cards disadvantages

Answer 24

• increased chance of jamming
• more open to interference
• transmission speed is comparably less

Question 25

hub advantages

Answer 25

* hubs are really inexpensive * they have less number of performance impacts on the network. This is often because it operates using a broadcast model which rarely affects the network * can connect to different types of media at once

Question 26

hub disadvantage

Answer 26

* hubs cannot support networks that are large like token rings * hubs can't communicate in full duplex mode only in half - duplex mode. ( half duplex means that data can only be transmitted at once , so hubs need to constantly switch modes )