DC Theory: Ohm's Law, Power, and Circuits for Electrical Apprentices

You cannot see electricity, so many apprentices start by memorizing formulas they do not understand. That is a mistake. To work safely and solve problems on a jobsite, you need to see a circuit like a plumber sees a pipe system. Voltage is the pressure. Current is the flow. Resistance is the pipe size. Once you see that relationship, the math starts to make sense. We start with the core rules of DC theory, like Ohm's Law and Watt's Law. You will move from simple circuits to more complex series and parallel systems. Instead of just doing math, you will learn why voltage drops across a long run of wire and why adding more loads to a parallel circuit actually makes it easier for current to flow. By the end, you will be able to look at a complex combination circuit and break it down into simple parts. You will know how to calculate current draw, check if a circuit can handle a specific load, and predict what happens when a wire breaks or a component shorts out. This is the logic you will use every day you have a meter in your hand.