How works an electronic circuit?

Before explaining what is an electronic circuit, we will give to a review to which is an electrical circuit first. When you are using a battery, a generator set or a solar panel to produce electricity, are three things that always are equal:

• The origin of the electricity will have two terminals: a positive terminal and a negative terminal.
• The origin of the electric flux - or a generator, battery, etc. - will want to push electrons outside its negative terminal a certain voltage. For example, a battery AA normally wants to push those electrons 1.5 volts.
• The electrons will have to flow from the negative terminal to the positive terminal by means of a copper cable or another type of conductor. When there is a way that goes from the negative terminal to the positive, you have a circuit, and the electrons can flow by the cable.
• You can include a load of any type (a light bulb, a motor, a television, etc.), in center of the circuit. The electricity source will feed the load, and the load will make its function (to create light, to generate images, to take a motor, etc.).

The electronic circuits can be returned very complex, but at a very basic level, always you have the source of the electricity (battery), the load and two cables to lead the electricity between the battery and the load. The electrons move from the origin, by the load and of return to the origin.
The electrons that move have energy. According to electrons they move from a point to another one, can carry out a work. For example, in an incandescent filament light bulb, the energy of electrons is used to create heat, and the heat to create light as well. In an electrical motor, the energy in electrons creates a magnetic field, and this field can interact with others (by attraction and magnetic repulsion) to create movement.
The electronic circuit
Basing us on the explained thing until the moment, an electronic circuit is an electrical circuit that also contains devices such as electronic transistors, valves and other elements. The electronic circuits can do functions complex using the electrical charges, although they are governed with the same laws that the electrical circuits. The electronic circuits can be classified in three groups, which are:

• Analogical circuits - They are those in which the electrical signals vary continuously to correspond with the represented information. The electronic equipment like the power or voltage amplifiers, radios, televisions, usually are analogical excluding many modern devices that usually use digital circuits. The basic units of the analogical circuits are liabilities - resistance, counsellors, inducers - and independent assets, power plants and dependent power plants.
  
• Digital circuits - In these circuits, the electrical signals obtain discreet values to show numerical and logical values that they represent the information to process. The transistors are used mainly like commutators to create footbridges logics. Some examples of electronic equipment that use digital circuits are the calculators, PDAs and the microprocessors.
  

Mixed circuits - These circuits are hybrid and contain analogical elements as much as digital. Some examples of these circuits are the converters of analogical to digitalis and vice versa