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LO1 - Coggle Diagram
LO1
Units of measurement
KB
Mb
Gb
Tb
Pb
Binary units
mib
kib
gib
tib
pib :
Mb : mib = 1000 : 1024
Computer components
processor and cpu
Brain of the computer, controls hardware,
motherboard
Printed circuit, connects everything, Heart of system
storage
Primary
RAM, ROM, register
Secondary
SSD, flash cloud and optical drive
Ports
VGA, Headphone jack, HDMI, Ethernet, USB, Power cable
power supply
Computer systems
Desktop systems
PCs Laptop
tablet
Ipad , access internet
smart phone
embedded
built in computers , microwave, cars
mainframe
solve scientific and engineering problems
number conversions
Binary to decimal
Decimal to binary
Hexadecimal to decimal
decimal to hexadecimal
Computer hardware
Input devices
Mic , Keyboard, mouse, scanner, joystick
input and output devices
Modem, touchscreen, CD
Output devices
speaker, monitor, printer, headphones, projector
communication devices
router, modem , wireless access point, switch, hub
connectivity
copper wires
STP, UTP, slower , degenerate
Coaxial :
degenerates over long distances.
Unshielded twisted pair :
is made by twisting the copper cables around each other and this reduces degeneration.
Shielded twisted pair:
uses copper shielding around the twisted wires to make them less susceptible to interference.
Fibre cables
faster, sending light down a line no thicker than hair
Wireless
Infrared
Uses infrared LED emitting light received by a photodiode in the receiving device e.g TV remote control. Cheap compared to other wireless technologies and works well over short distances
laser
Sending large quantities of data using a light beam to devices in line of sight. Also satellite to satellite communications
bluetooth
Short range communications between two devices without the need for a wireless network hub
microwave
Used short radio waves to send signals via microwave towers. Can provide analogue or digital formats
wi-fi
Connecting devices via a hub
communication hardware
Network hub
central component connecting all devices
switch
receives packets , processes them then forwards them on
Router
forwards packets between networks
number systems
Decimal
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
Binary
11010101
Hexadecimal
1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,
hardware troubleshooting
Identify faults
date, username, symptoms, machine, error message
Troubleshooting tools
Event viewer, ping test, IP config, self test programs
