Answer by Egirl Team
That is a question that can’t be answered in just a few lines. There is quite a lot to it. If you are really interested in the subject you might consider studying online. Here is one resource that might get you started: http://www.electronicstheory.com/COURSES/ELECTRONICS/e101-1.htm
The winners of the 2016 EngineerGirl Essay Contest have been announced! NAE President C. D. Mote, Jr. said, "It is inspiring to see students exploring the meaning of responsible engineering, for it is a primary concern for engineering in advancing our society." Check out the link below to read the wonderful essays.