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What is an input device ?
its a device where it allows data to be entered into the computer
What are some examples of an input device ?
QWERTY keyboard, mouse, microphone
What is an output device ?
its a device that display information from the computer
What are some examples of an output device ?
printers, plotters, speakers, headphones, projector
What are also some examples of output screens ?
VDU (Visual Display Unit). LCD (Liquid, Crystal Display), LED (Light Emitting Diodes)
What does ergonomic mean ?
designed specifically
What are some examples of ergonomic IT equipment ?
Chairs, Keyboard and Mouse
What are those equipment specifically designed for ?
conditions like back problems and carpel tunnel syndrome
What is CPU stand for ?
Central Processing Unit
What is the CPU known as ?
the brains of the computer but also where the calculations take place
What are the two parts of the CPU?
the control unit and arithmetic and logic unit
What is the main function of the CU (Control Unit)
it transfers instructions and data from input or storage devices to a temporary storage called registers
What is the main function of the ALU (Arithmetic and Logic Unit)
it performs the calculations such as add, subtract but also compare values like equal to, greater than or less than
What is the motherboard ?
the motherboard is essentially where everything connects
What are some examples of storage ?
hard drive, solid state, flash
What are some examples of ports ?
USB, firewire, network
what are the 3 main memories ?
RAM, ROM and Cache
What does RAM stand for ?
Random Access Memory
What does ROM stand for ?
Read Only Memory
what is the main feature of cache ?
its the fastest memory inside the CPU
What is a limitation about cache ?
it is very expensive
What kind of device is MODEM ?
communication device
What are some other examples of communication devices ?
Hub, Switch, NIC, Wireless Network Card, Wireless router
What can the switch do that the hub can’t ?
it can identify machine numbers
What does MODEM stand for ?
Modulator and Demodulator
What does the modulator do ?
converts analogue signals to digital signals for the computer to understand
What does the demodulator do ?
converts digital signals to analogue signals to go through the telephone
What does WI-FI stand for ?
Wireless Fidelity
between WI-FI and Bluetooth, which one allows connection to many devices at once ?
WI-FI
What type of range is it and how long for WI-FI ?
its a long range with 300 metres
What type of range is it and how long for Bluetooth ?
its a short range with 10 metres only
What is a similarity between WI-FI and MODEM ?
they both can connect to the internet but also convert analogue to digital or digital to analogue
between WI-FI and MODEM, which one offers wireless features ?
WI-FI
What is computer speed measured in ?
Hertz (Hz)
What is an embedded system ?
a computer system built into a large machine for only a specific purpose
What are some examples of an embedded system ?
washing amchine, satnav, fridge
What are the 6 types of computer systems ?
desktop, server, tablet, embedded system, mainframes and quantum computer
What is a mainframe ?
one of the most expensive computers with many cores to enable to process information faster
What kind of industry would have a mainframe computer ?
banks
What are the three types of wired connectivty ?
COAXIAL, fibre and unshielded twisted pair
What types of cables are these ?
copper
What are the 6 types of wireless connectivity ?
bluetooth, WI-FI, microwave, infrared, laser and GSM
What are the different generations ?
1G, 2G, 3G, 4G and 5G
What is a RFID ?
its a radio frequency identification which uses frequency to transfer information from your card
What is NFC ?
its near field connection which allows contactless payment
What is NIC ?
its a network interference card which connects laptops to the network or internet
What are 3 main types of connectivity hardware ?
identifying hardware faults, troubleshooting tools and documentation/fault management
What are some examples of hardware faults ?
power surge, poor maintenance, accidental and intentional damage and also malware or viruses
What are the 3 troubleshooting tools ?
POST beep code, PING test and IPconfig/IFconfig
What does POST beep code stand for ?
Power On Self Test
What are the 5 devices used in communcation ?
hub, MODEM, switch, WAP and router
What does WAP stand for ?
Wireless Access Point
What are the characteristics of HUB ?
it connects multiple computers in a network as well as allow to send messages to all computers at once
What is better about HUB than SWITCH ?
it is cheaper
What is limitation about HUB ?
a security nightmare, unauthorised access to information
What are the characteristics of SWITCH ?
it connects multiple computers together in a LAN and can also differentiate computers apart using MAC
What is better about SWITCH than the HUB ?
it is more clever
What are the characteristics of the ROUTER ?
it sends packets of data between different networks and is typically used to share broadband internet connection to multiple computers
What does ADSL stand for ?
Asymmetric Digital Subscriber Line
What does ADSL do ?
it is a broadband connection that works through coper wires of existing phone lines
What is ADSL mainly used for ?
home broadband and also within small businesses
What is a dedicated leased line ?
a leased line that gives you a singular line all to yourself
How does it give you a whole singular line to yourself ?
by allowing there to be no busy periods or dips in data devices
What does a based line give ?
a dedicated connection between our premises and the local exchange
What are the smallest bits ?
0 and 1
What does 4 bits equal to ?
a nibble
what does 8 bits equal to ?
a byte
What is BITS short for ?
Binary Digits
What does binary mean ?
two parts
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