Electrical Basics

Single-phase and three-phase AC squirrel cage induction motors need some type of circuit to initiate a start or stop function. Usually single-phase motors and...

A transformer is an electromagnetic device without any moving parts that allows for changes in voltage, current, and impedance. The goal of an ac...

A little bit of history is in order before we get into AC and DC circuit theory. In the latter part of the 19thcentury...

By strict definition a material can be classified as either a conductor, an insulator, or a semiconductor based on its electrical properties. Before getting...

Five to ten times per day, an electrical arc-flash accident occurs that seriously injures or kills someone in the United States. Standards such as...

The CE Code requirements for bonding and grounding are perhaps, the most important safety rules for electrical installations. Each person deemed to be qualified...

People are getting hurt using multimeters. That is a fact. Every day, electrical inspectors and investigators potentially expose themselves to some sort of risk...

Electrical system grounding is not widely understood,and it may lead to many different discussions, interpretations and a wide variation of philosophies. This article reviews...

In part nine of this series, I discussed the development of the phasor diagram, a graphical representation of voltage or current magnitude in ac...

Phasors It is time to bite the bullet. Before we can continue into three-phase electrical circuits and calculations, we have to have a solid understanding...