### Summary

While this lesson was very calculation-heavy, we are now in a position to model economic decisions in the operation of electric power grids, whether those decisions are made by regulated electric utilities or competitive power generation firms. We used a few laws of physics, including the mathematics of series/parallel resistances, Ohm's Law and superposition to be able to calculate power flows for two-node and three-node networks. For three-node networks in particular, use of the distribution factor representation of the flow equations can come in very handy.

### Reminder - Complete all of the Lesson 2 tasks!

You have reached the end of Lesson 2! Double-check the to-do list on the Lesson 2 Introduction page to make sure you have completed all of the activities listed there before you begin Lesson 3.