The traditional and broad definition of electrical engineering refers to the sum of related disciplines used to create electrical and electronic systems. With the rapid development of science and technology, the concept of electrical engineering has gone far beyond the scope of the above definition. Professor of Stanford University pointed out that "today's electrical engineering covers almost all engineering behaviors related to electrons and photons". It is the great progress of electronic technology that has promoted the arrival of the information age based on computer network and changed all aspects of human life and work mode. The discipline of electrical engineering in American universities, also known as the Department of Electrical Engineering, Department of Electrical Engineering and Information Science, Department of Electrical Engineering and Computer Science, etc., mainly focuses on computer and information technology.