First off, great site, I have a masters in Electrical Engineering and im going through the whole book to refresh my memory on some of the topics. As I go through it, ill be sure to post any typos I find along the way. So far here is what I have. Chapter: All About Circuits > Volume I - DC > Chapter 1: BASIC CONCEPTS OF ELECTRICITY > Voltage and current Typos (marked in red): REVIEW: Electrons can be motivated to flow through a conductor by a the same force manifested in static electricity. Voltage is the measure of specific potential energy (potential energy per unit charge) between two locations. In layman's terms, it is the measure of "push" available to motivate electrons. Voltage, as an expression of potential energy, is always relative between two locations, or points. Sometimes it is called a voltage "drop." When a voltage source is connected to a circuit, the voltage will cause a uniform flow of electrons through that circuit called a current. In a single (one loop) circuit, the amount current of current at any point is the same as the amount of current at any other point. If a circuit containing a voltage source is broken, the full voltage of that source will appear across the points of the break. The +/- orientation a voltage drop is called the polarity. It is also relative between two points. PS. If you ever want a volume on Wafer fabrication, basically how they go from grains of sand to wafers with transistors, resistors, capacitors let me know. I also have quite a bit of knowledge in MEMS.