In addition to parallel and series, impedances also can make star and delta connections. Also are shown the transformations.

# Category: Basic concepts

## Why is the system three-phase?

Why is the production, transmission, and distribution of electrical energy system three-phase, instead of single-phase? Let’s find out in this post.

## Classical control: Theoretical introduction

This post’s subject is an introduction to classical control theory. Where is used PID controller, with only one input and one output.

## Capacitance and inductance: More information

I received requests to write more about capacitance and inductance. This post can be considered as the second part of derivated electrical quantities.

## RL circuit analysis

Today is shown how to do RL circuit analysis which have resistors, switches and inductors.

## WEG museum of science and technology (Part 1)

The WEG museum of science and technology stays in the city of Jaraguá do Sul (South Jaraguá), in Santa Catarina state, Brazil. In this city also stays the HQ of…

## Basic concepts of alternate current (AC)

Meeting requests, the subject is about basic concepts of AC. Has been already mentioned AC in the post about electromagnetism, this post will go deeper.

## Circuit analysis (Part 2)

In this second part, will be presented two circuit analysis methods. Will be shown only DC circuits with resistors.

## Circuit analysis (Part 1)

This is a basic concepts post destined to students and beginners in the area. This is the first part about how to make circuit analysis in direct current only with resistors.

## Power and power factor

This is one more post about basic concepts directed to students and beginners in the area. Also will talk about power factor, an important parameter in AC systems.