Electronic components are discrete devices in electronic systems that affect electrons and electric fields. They can be active, passive or electromechanical. Active components include triode vacuum tubes, transistors and tunnel diodes which rely on a source of energy, while passive components are resistors, inductors, transformers and capacitors. Electromechanical components, such as piezoelectric devices and crystals drive an electrical operation with the use of moving parts or electrical connections. Electronic components can have a number of electrical leads or terminals. These connect to an electrical circuit that delivers a particular function. This book outlines the varied components of an electronic circuit and their applications in detail. It consists of contributions made by international experts. Scientists and students actively engaged in electronic engineering will find this book full of crucial and unexplored concepts.