As circuits became more complex, we needed better maps. introduced two vital laws to manage "traffic" at circuit junctions:
The energy "pushed" into a loop by a battery must be completely "used up" by the components in that loop. Chapter 4: From Theory to Technology Electrical Circuit Theory and Technology
): The "pressure" or push provided by a source like a battery. The actual "flow" of electrons through the path. Resistance ( As circuits became more complex, we needed better maps