What is ELECTRONICS in physics?

Electronics is a branch of physics and engineering that deals with the behavior and control of electrons (or other charge carriers) in vacuum, gas, or semiconductor materials. It involves the design, development, and application of devices and systems that use electronic circuits to process and transmit information, such as computers, televisions, radios, and smartphones. Electronics also encompasses the study of electronic components, such as transistors, diodes, resistors, capacitors, and integrated circuits, as well as the principles of electricity and magnetism that govern their operation.

What are some of the formula of that topic