Computer Science
Name 4 input devices
Mouse
Headphones
USB stick
Hard Drive
Keyboard
Joystick
Scanner
Define a 'Computer'
An electronic device for storing and processing data according to the isnstructions given to it in a vairable program
Give 3 features of a keyboard
Has numbers 1-9
Has all logic symbols
Has all punctuation
Has two shift buttons which allow faster/ more efficirnt access to capital letters/shift lock keys
Define a 'Sensor'
A hardware device that can measure physical properties e.g. temperature. These measurements are a representation if the actual properties being measured
Name 3 types of sensor
Temperature
Infra-red
Light
Pressure
pH
Magnetic Field
Gas
Moisture humidity
Name 3 output devices
Inkjet printers
Laser jet printers
3D printers
Define 'RAM'
Fast memory which is used to store data/programs which are currently in use. RAM is volatile
Define 'ROM'
Data that cannot me modified by a user, it can only be read. ROM in non-volatile
Give differences between RAM and ROM
RAM can be read/written to
ROM can only be read from
RAM is volatile
ROM is non volatile
Give advantages and disadvantages of using HDDs over SSDs
Advantages:
Stores larger amounts of data
Cheaper than SSDs
Data is easier to recover if damaged
Disadvantages:
Slower data transfer speeds
Has moving parts, so its more fragile
Give advantages and disadvantages of using SSDs over HDDs
Advantages:
Doesn't require defragmenting
More durable
Consumes less power
Very quiet
Portable
Disadvantages:
More expensive than HDDs
Has a lower lifespan
Give 2 types of magnetic storage
HDDs
Magnetic tapes
Define 'Virtual storage'
Data stored remotely so that it can be accessed by any computer
Give advantages and disadvantages of virtual storage
Advantages:
Its more convenient as you can access data from any device connected to a system
Disadvantages:
Quite expensive as how well it works depends on a users network speed