The electronics is a part of the physicist who takes charge of the study of the electrical systems focused from the point of view of the individual behavior of the electron (the minimal electrical particle).

His relation with the electricity is very narrow, of that time sometimes it is complicated to separate one of other one.

The digital electronics considers discreet values of tension, current or any another measurement; these are certain concrete values, while the analogical electronics, which connsideramos in this section, he considers and works with continuous values of these variables; being able to take, theoretically, infinite values.

Example:

We have a concrete real measurement; for example, the entire length of a car.

In a digital system the measurement of the car might be 4 meters or 4 meters and 51 cm. We will be able to give him any presición but there will always be numbers you inform.

In an analogical system the real serious measurement; that is to say 4,51528397... theoretically until we were coming to the minimal quantity of existing matter (whenever the measurement instrument is the sufficiently exact thing).

Article based on the Wikipedia