The International System of Units (SI), often dubbed the metric system, is a standardized framework for measuring physical quantities. It's commonly accepted globally and forms the basis of scientific exchange. The SI system consists of seven primary units, these serve as the foundation for all othe

Relays are electromechanical instruments that utilize an electromagnet to switch an electrical circuit. The basic design of a relay comprises a coil, armature, contacts, and a spring mechanism. When current flows through the coil, it creates a magnetic field which draws the armature, causing the con