K. Sivasankari is the Associate Professor and Head in the Department of Electronics and Communication Engineering at Akshaya College of Engineering and Technology, Coimbatore. She obtained her B.E. degree in Electronics and Communication Engineering from Kumaraguru college of Technology, Coimbatore. M.E. degree in Applied Electronics from Government College of Technology and Ph.D in the area of Biomedical Signal Processing from Anna University, Chennai. She has more than a decade of teaching experience and experience in industry. Her areas of interest include Electronic devices, Circuit eor y, Digital Signal Processing, Biomedical Instrumentation, Electronic Circuits, Digital Signal Processing and Artificial Intelligence. She has also published several papers at National and International levels. She is a life member of ISTE and various other professional bodies.
Materials can be categorised into conductors , semiconductors or insulators by their ability to conduct electricity. It is a popular belief that insulators do not conduct electricity because their valence electrons are not free to wander throughout the material. In fact they are free to move around, however, in an insulator there are as many electrons as there are energy levels for them to occupy. If an electron swaps place with another electron no change is made since electrons are indistinguishable. There are higher energy levels, but to promote the electrons to these energy levels requires more energy than is usually practical.