Electricity - Magnetism and Electronics:

Electricity is the part of physical phenomena related with the presence and flow of electric charge. Electricity provides a wide variety of well-known effects, such as lightning, electromagnetic induction, static electricity and the flow of current. In addition, electricity allows the creation and reception of electromagnetic radiation as like radio waves.

Magnetism is a charters tic of materials that respond to an applied magnetic field. Permanent magnets have steady magnetic fields defined by ferromagnetism. That is the strongest and very familiar type of magnetism. Though, all materials are influenced varyingly by the existence of a magnetic field. Some are attracted to a magnetic field (paramagnetic); others are repulsed by a magnetic field (diamagnetism); others have more complex relationship with an applied magnetic field. Substances that are not reflected by magnetic fields are called as non-magnetic substances. They include copper, gases, aluminum and plastic. Pure oxygen exhibits magnetic properties if cooled to a liquid state.

Electronics deals with electrical circuits that add active electrical components such as transistors, vacuum tubes, diodes and ICs, and associated passive inter connection technologies. The nonlinear nature of active components and their ability to manage electron flows makes amplification of weak signals possible and electronics is mainly used in information processing, signal processing and telecommunications. The ability of electronic devices to behave as switches makes digital information processing possible. Inter connection technologies as like circuit boards, electronics packaging method, and other varied forms of communication infrastructure full circuit functionality and change the mixed elements into a working system.