A transistor in its simplest form is an electronic switch. This tutorial explains how a small amount of current can be used to switch on or off a much larger amount of current. 

A colour changing LED contains a red, green and blue LED along with a small computer to drive them, but how do they work to produce different coloured light? Find out in this tutorial.

Ceramic disc capacitors markings are a two or three digit value, this tutorial explains how to use the code to determine the capacitance in Farads.

A guide on using capacitors, their circuit symbol, values & charging through a resistor.

A light dependant resistor or LDR is a sensor that changes resistance as the light level changes, see example circuits and explanations in this tutorial. This tutorial also covers what an LDR looks like, the circuit symbol, typical resistances for different light levels and some example applications.

A quick reference guide to identifying & orientating components.