Archives: Theory

Converting Decimal to Hexadecimal

There are several ways to convert decimal (sometimes called denary, or base 10) numbers into hexadecimal (base 16). The video below gives a step by step guide on how to convert decimal numbers into binary…

Converting Decimal to Binary

There are several ways to convert decimal (sometimes called denary, or base 10) numbers into binary. The video below gives a step by step guide on how to convert decimal numbers into binary code using…

Logic Gates

Logic gates are the building blocks of a digital circuit. Every terminal in a logic gate will always be in one of the two binary states (0) or (1). These binary states represent the presence…

Duplex, Half Duplex and Simplex

Duplex, Half Duplex and Simplex are the three possibilities for the direction of data transmission. Simplex Simplex is data transmission in one direction only.  Two directional transmission is not possible. e.g. a radio station broadcast….

Web Server

A web server is a computer dedicated to storing web pages securely and delivering them to users when requested. A website developer would upload their website to a web server using FTP. Web servers are switched on 24…

Web Browser

The role of a web browser A web browser is a software program which allows the user to request and retrieve web pages (and other resources) from a webserver on the world wide web. Web…

Computer Ethics

Computer ethics refers to a set of principles to regulate the use of computers. Ethics has become an important consideration due to the spread of computerised systems and electronic communications. Computer ethics can be broken…

Secure Sockets Layer

Secure Sockets Layer (SSL) uses authentication and encryption to create a widely used online security protocol.  SSL allows data to be sent and received securely over the internet. SSL consists of a digital certificate, hosted…

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