electronics
electronics involves the study of circuits and components that modify the intensity, direction or properties of electric currents.



electronic components
 in the section, we will analyse the most common electronic components.

fixed resistance or resistor
 opposes the flow of electric currents. its value which we measure in ohms, is indicated by a code of colours and numbers.

variable resistance or potentiometer
what the difference between a potentiometer and a variable resistor
A variable resistor is made up of a potentiometer wired with the center leg tied to one or the other end of the pot. This permits it to act like a variable resistor.

resistance that depends os a physical factor
There are four factors that influence the resistance in a conductor. Thickness, length, and temperature. The fourth factor is the conductivity of the material that is used. Some metals (copper, silver) are just more electrically conductive than others (iron, aluminum)

capacitors
are components that can store an electrical charge (the value of capacitor indicates the charge in volts that it can store -- farads)

diodes
diode is a two-terminal electronic component that conducts primarily in one direction; it has low (ideally zero) resistance to the current in one direction, and high (ideally infinite) resistance in the other.


transistors
A transistor is a semiconductor device used
to amplify or switch electronic signals and electrical power
(they are made from the base, the collector and the emitter)