Chapter 3 : Hardware

Question 1

Types of devices

Answer 1

Input
Input/output
Output
Storage
Processing

Question 2

Input device

Answer 2

Hardware device that allows the user to interact directly with a computer

Question 3

Input device examples

Answer 3

Keyboards
Pointing devices (mouse)
Scanners

Question 4

Input/output device

Answer 4

Hardware device that allows a human operator or other systems to communicate with a computer by sending data to a computer (output) and receiving data from a computer (input)

Question 5

Examples of input/output devices

Answer 5

Touch screens
Digital cameras
Smartboards

Question 6

Output devices

Answer 6

Hardware devices that takes data stored on a computer and makes it available to the user in a way that is easy to understand

Question 7

Forms of output

Answer 7

Pictures
Sounds

Question 8

Storage devices

Answer 8

Devices with the general purpose to store data

Question 9

How do storage devices differ?

Answer 9

capacity
portability
speed
- used for different reasons

Question 10

types of storage devices

Answer 10

hard disk drive (HDD)
external (portable) hard drives
solid-state drive (SSD)
hybrid storage device
flash drives (disks)
SD/memory cards
cd/dvd/blu-ray drives

Question 11

Processing devices

Answer 11

Devices responsible for carrying out instructions and performing calculations

Question 12

Types of processing devices

Answer 12

central processing unit (CPU)
graphics processing unit (GPU)

Question 13

Mobile technologies

Answer 13

Small, powerful computing devices that are easy to carry around, like smartphones, laptops and tablets

Question 14

How are mobile technologies similar to DT computers?

Answer 14

most of same hardware

Question 15

SP/mobile technology advantages over DT computer

Answer 15

• built-in communication devices (BT and WiFi), better at connecting to internet
• location-based computing
• size and weight, portable, convenient, mobile, comfortable use anywhere

Question 16

DT computer advantages over SP/mobile technologies

Answer 16

• more RAM and faster processors
• bigger screen, not limited info (spreadsheets, word processing)
• more comfortable and precise keyboard and mouse over touchscreen (large text input)

Question 17

Generally, what is DT used for and what smartphone used for?

Answer 17

DT: powerful, serious computing tasks (large processing power required), large user input
SP: tasks requiring mobility, where convenient

Question 18

However, how have uses of SP changed over years?

Answer 18

• more powerful
• outperforming DT computers

Question 19

mobile constraints

Answer 19

disadvantages of smart phones, laptops and tablets caused through battery life and computing power versus power consumption

Question 20

how mobile constraints differ from previous disadvantages

Answer 20

disadvantage independent of relation to DT computer
think of as scope of ability of mobile technologies

Question 21

name mobile constraints

Answer 21

battery life
computing power

Question 22

why does battery life constrain mobile technologies - how affect and why issue

Answer 22

1. processing power of CPU linked to amount of electricity available to it : more power used, more instructions completed
2. issue because limited amount of power stored in battery, and needs to last whole day

Question 23

how is computing power affected by mobility of technologies?

Answer 23

• small size of devices > all components - miniaturised

Question 24

how have mobile technologies adapted to compute as DT computers do?

Answer 24

• chips contain many components, incl. CPU, GPU, LTE modem, WiFi connector, RAM, BT connector, GPS tracker
• DT separate, hence each more powerful

Question 25

how do mobile constraints relate to one another?

Answer 25

power consumption - high processing tasks use great power - smaller components overworked, overheats - battery flat quickly

Question 26

what is computer performance mainly dependent?

Answer 26

processing performance - think mainly CPU, but also GPU ig

Question 27

factors having a direct effect on CPU (therefore computers) performance

Answer 27

- CPU speed - CPU ability to run multiple processes (do multiprocessing)

Question 28

speed of CPU

Answer 28

how many instructions it can complete per second - more = faster

Question 29

what is speed of CPU linked to

Answer 29

CPU's clock speed: how frequently CPU completes an instruction per second

Question 30

i dont undertand clock speed vs CPU spped SEND HELP

Answer 30

thank youm futurre lucy ilysm -p maybe smth like frequency wave idk :P

Question 31

clock speed measured in

Answer 31

MHz or GHz

Question 32

what does multiprocessing allow

Answer 32

complete tasks from multiple apps simultaneously

Question 33

bad multiprocessing computer consequence

Answer 33

stutters if tries to run too many processes simultaneously

Question 34

how does other type of processing affect computer performance and what is it?

Answer 34

GPU!! - normal apps: not affect - graphic-intensive tasks, great affect on performance if slow

Question 35

factors affecting GPU performance

Answer 35

GPU clock speed (MHz) - higher, more instructions able to process GPU type

Question 36

other factors affecting performance of computer

Answer 36

memory capacity storage speed disk caching network interface card (NIC)