Hello, today in our Linear Circuits course we are going to start talking about Module 5, Power. Here is our concept map. We have already talked about the background, resistive circuits, reactive circuits and frequency analysis. Now we are going to start talking about power. Power typically is going to be done in AC, and so it's going to be making use of a few of the different concepts that we've already discussed. First of all, from resistive circuits, we are going to use the equations that we did for calculating maximal power transfer and some of those techniques. We'll also make use of some of the techniques that were used for analyzing resistive circuits. From frequency analysis, we will make use of impedances and phasors. In Module 5, under Power, we will be talking about a number of different concepts. First of all, we will talk about root mean square calculations, which is just a mathematical tool that will allow us to improve our analysis. We will then talk about apparent power, reactive power, power vectors and transformers. Transformers are linear devices that are encountered in many applications, but particularly they have prime prominence in power applications. We'll discuss some of the places that we encounter transformers in and practical applications when we're discussing that portion of the power section.