Introduction

Almost none of the tasks and activities mentioned above could happen (or would happen as easy as they do now) without some sort of electrical and electronic

equipment. What is important to note is that the huge infrastructure that makes all these tasks possible are invisible to us. These include, but not limited to, the telecommunication and networking equipment owned by telephone and internet providers, the data servers and storage equipment in TV stations and movie making studios, the data processing servers and computers in banks and other financial centers, and the complex electronic circuits inside automobiles.