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About the Book

Welcome to the AC Electrical Circuit Analysis, an open educational resource (OER). The goal of this text is to introduce the theory and practical application of analysis of AC electrical circuits. It assumes familiarity with DC circuit analysis.

About the Contributors

My name is Jim and I'm the resident dissident, programmer and author. I've been a college professor for many years teaching in the areas of electrical engineering technology, computer programming and the science of sound. I'm also a musician and an endurance athlete.

Preface

This article is the first in a series of articles that will help to bring light to the maintenance practices presently applied to power circuit breakers.

Introduction

A power circuit breaker is equipment intended to switch on and off electric currents on power transmission and distribution networks for routine operations and protection of other equipment.

Description

Its name, circuit breaker, indicates clearly its role. It breaks electric circuits. To achieve this purpose, it separates mechanically two points in the circuit to a certain distance large enough to break the flow of electric currents.

What are phasors used for in AC circuits?

In the analysis of an AC circuit, voltage and current phasors are used with resistances and reactances in much the same way that voltages and currents are used with resistances in the analysis of a DC circuit.

What is phasor domain?

The phasor-domain circuit is the circuit that is actually analyzed. It has the advantage that the resistances and reactances have the same ohm unit and so can be combined similarly to the way that resistances can he combined in a DC circuit analysis. Also, the analysis of the phasor-domain circuit requires no calculus, but only complex algebra.