A module is a separate unit of software or hardware. Typical characteristics of modular components include portability, which allows them to be used in a variety of systems, and interoperability, which allows them to function with the components of other systems. The term was first used in architecture.
A silicon-controlled rectifier is a semiconductor device that is used as a switch in an electrical circuit.It's a solid state direct current (DC) electronic switch. There is a ton of information including a detailed description of the SCR and a list of applications at the Wikipedia article.A link is posted below. silicon-controlled rectifier is a semiconductor device that is used as a switch in an electrical circuit.
The term SCR or silicon controlled rectifier is often used synonymously with that of thyristor - the SCR or silicon controlled rectifier is actually a trade name used by General Electric. The idea for the thyristor was first described by Shockley in 1950.