Foundations of Electrical Systems
Richard Cadena · 2021
Electricity is a fascinating phenomenon. It is energy that can be manifest as light, sound, heat, or movement, and that is why it is so important to those people in the entertainment industry. People use it to create fantastic lighting, beautiful sound, awesome video images, and spectacular special effects. But to a novice, the behavior of electricity can be elusive and challenging to understand because people cannot see it; its nature is obscured by a veil of mystery. Water pressure in a hydraulic system is much like the “electrical pressure” or voltage in an electrical system. The pipe that carries the water to the neighborhood is like a conductor that carries electrical current from an electrical supply to a lamp or other load. Resistance is the opposition to the free flow of electrical current. It is a physical phenomenon caused by free-flowing electrons, which are subatomic charged particles.