Standard Motor Control Circuits

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...

Introduction to Transformers

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

Electrical Fundamentals — Basic Electric Circuit Theory

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

An Introduction to Electrical Fundamentals

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

Arc Flash Overview

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...

Bonding and Grounding. Is there a reason to be confused?

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

Multimeter Accident Prevention Plan, An Electrical Inspector’s Survival Guide

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

Grounding Basics

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...

Basic Electricity – Part 10

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

Basic Electricity, Part 9

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...