The hasty progress of mobile/wireless communication and embedded micro-sensing MEMS technologies has lead us towards the trance “Ubiquitous/Pervasive computing. Wireless local-area and personal-area networks are now common tools for many people, and it is predicted that wireless sensor networks will greatly improve every day life to access information and use computing resources anytime and anywhere. Sensor nodes are characterized by multiple nodes that sense, collect and disseminate information from a hostile environment. The non-renewable nodes have pushed energy consideration to the forefront of sensor network research. The book aims to provide research issues and solution pertaining to energy management in wireless sensor networks with significant results and findings in the field, while at the same time describing in detail the many problems that are still to be solved. The book will serve as an excellent source of information for students, researchers and practitioners who want to track new research and development in wireless sensor networks.