Chapter 3 : Hardware Flashcards
Types of devices
Input
Input/output
Output
Storage
Processing
Input device
Hardware device that allows the user to interact directly with a computer
Input device examples
Keyboards
Pointing devices (mouse)
Scanners
Input/output device
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)
Examples of input/output devices
Touch screens
Digital cameras
Smartboards
Output devices
Hardware devices that takes data stored on a computer and makes it available to the user in a way that is easy to understand
Forms of output
Pictures
Sounds
Storage devices
Devices with the general purpose to store data
How do storage devices differ?
capacity
portability
speed
- used for different reasons
types of storage devices
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
Processing devices
Devices responsible for carrying out instructions and performing calculations
Types of processing devices
central processing unit (CPU)
graphics processing unit (GPU)
Mobile technologies
Small, powerful computing devices that are easy to carry around, like smartphones, laptops and tablets
How are mobile technologies similar to DT computers?
most of same hardware
SP/mobile technology advantages over DT computer
- built-in communication devices (BT and WiFi), better at connecting to internet
- location-based computing
- size and weight, portable, convenient, mobile, comfortable use anywhere
DT computer advantages over SP/mobile technologies
- 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)
Generally, what is DT used for and what smartphone used for?
DT: powerful, serious computing tasks (large processing power required), large user input
SP: tasks requiring mobility, where convenient
However, how have uses of SP changed over years?
- more powerful
- outperforming DT computers
mobile constraints
disadvantages of smart phones, laptops and tablets caused through battery life and computing power versus power consumption
how mobile constraints differ from previous disadvantages
disadvantage independent of relation to DT computer
think of as scope of ability of mobile technologies
name mobile constraints
battery life
computing power
why does battery life constrain mobile technologies - how affect and why issue
- processing power of CPU linked to amount of electricity available to it : more power used, more instructions completed
- issue because limited amount of power stored in battery, and needs to last whole day
how is computing power affected by mobility of technologies?
- small size of devices > all components - miniaturised
how have mobile technologies adapted to compute as DT computers do?
- chips contain many components, incl. CPU, GPU, LTE modem, WiFi connector, RAM, BT connector, GPS tracker
- DT separate, hence each more powerful
how do mobile constraints relate to one another?
power consumption
- high processing tasks use great power
- smaller components overworked, overheats
- battery flat quickly
what is computer performance mainly dependent?
processing performance - think mainly CPU, but also GPU ig
factors having a direct effect on CPU (therefore computers) performance
- CPU speed
- CPU ability to run multiple processes (do multiprocessing)
speed of CPU
how many instructions it can complete per second - more = faster
what is speed of CPU linked to
CPU’s clock speed: how frequently CPU completes an instruction per second
i dont undertand clock speed vs CPU spped SEND HELP
thank youm futurre lucy ilysm -p maybe smth like frequency wave idk :P
clock speed measured in
MHz or GHz
what does multiprocessing allow
complete tasks from multiple apps simultaneously
bad multiprocessing computer consequence
stutters if tries to run too many processes simultaneously
how does other type of processing affect computer performance and what is it?
GPU!!
- normal apps: not affect
- graphic-intensive tasks, great affect on performance if slow
factors affecting GPU performance
GPU clock speed (MHz) - higher, more instructions able to process
GPU type
other factors affecting performance of computer
memory capacity
storage
speed
disk caching
network interface card (NIC)
