History of Computing
All you need to know about Computing
Input Devices
An input device is a piece of a hardware equipment use to control signals or to provide data to a processing system such as a monitor or other information appliance.
Keyboard
A keyboard is included as an input device because whenever we press one of the keys, the keyboard sends commands to the computer and the computer receives it and then the computer sends the command to the screen.
Mouse
Mouse is an input device because it sends signal to the computer to control the arrow on the monitor.
Controller
A controller sends a signal to the console, which the console processes it and outputs the commands from the controller to the screen.
Microphone
Microphone is an input device because it sends the electrical signal from the sound to the amplifier or speaker.
Touch Screen
A touch screen is a computer display screen that is also an input device. The screens are sensitive to pressure; a user interacts with the computer by touching pictures or words on the screen which sends commands to its system.
DVD Player
DVD player takes the information from the CD and then releases the commands from the CD to the TV
Output Device
An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system.
Headphones
Headphones outputs the command from a device's audio that is connected to the headphone
Printer
A printer takes texts and pictures from a computer and then transforms the information it received into a paper.
Projector
Projector accepts information from a computer that is connected to it and outputs the information on anything that is facing to the projector head.
Speakers
Speakers is similar to headphones but the difference is that speakers amplifies the sound.
Monitors
Monitor is the main thing in a computer because it is displaying what the system of the whole thing is doing and processes it to the screen.
USB
A USB is both input and output because it inserts the information to the CPU and it also takes information from the CPU to store it in its RAM.
What's inside a computer?
CPU
a CPU is a Central Processing Unit which is the brain of the computer. It carries out the command of the input and output device.
RAM
Random Access Memory is what RAM stands for. RAM is the memory of a computer. RAM could be accessed randomly on a computer.
Power Supplier
Power Supplier is an electrical supply for a device such as computer. This runs the computer with the energy they are sending it.
Hard Drive
Hard drive is a storage device use for storing and retrieving digital information using a hard quick rotating disk.
Motherboard
A motherboard is the main thing in a computer. It holds together all the components of a computer. It works as a backbone of a computer.
Graphics Card
Graphics card is connected to the motherboard and it generates the output images to display. It includes processing unit, cooling system and connection to the display device.
Network Card
Network Card is usually installed to a computer. It provides the computer with networks that are connected to the computer. It connects the computer with a computer network usually a LAN.
What's a Binary Code ?
A Binary Code is the code that the computer only understands. A Binary Code only involves to different types of codes which is 0,1. Computers don't understand any other code than that.
Example- 01000 00101 01100 01100 01111 (This says 'Hello')
Alan Turing
Alan Turing is a computer scientist who works for the country. He is mathematician and logician. During WW2 he tries to crack the enemies code. He also made a machine that was able to help him crack the code. After he cracked the code the Germans stopped the war. It is estimated that he has shortened the war by two to four years.
About Networks
A computer or data network is a communication between computers which allows computer to share data. The connections are established by using a wired media or a wireless media. They share a data by using data link.
What do you need to make a computer network?
- Router/Wireless access point
- Wireless Print server
- Modem
- Computers
- Switch
- Internet
Types of Network
Ring Network
Advantage - There is no possible way of data collisions and also the transmission of data is simple.
Disadvantage - If one cable breaks the whole network gets affected. The setup of the ring network is expensive
Bus Network
Advantage - It's easy to setup and add new devices. It's cheap to install, as it doesn't require much cable.
Disadvantage - Data collisions can occur easily and there is low security as a broadcast network.
Star Network
Advantage - There are less chance of data collisions. The data goes straight from sender to receiver not broadcast.
Disadvantage - It requires too many cabling which is very expensive and all of the computer are connected to the hub/switch which means if it have problems the whole thing gets affected.