Our goal in this present chapter is to understand fluids and the flow of electric charge in electric circuits using the Steady-State Energy Density Model. Historically, different words and symbols hav...Our goal in this present chapter is to understand fluids and the flow of electric charge in electric circuits using the Steady-State Energy Density Model. Historically, different words and symbols have been used for the description of each of these phenomena, making their similarity even more difficult to see. We will generally use conventional notation and vocabulary, but will continuously draw parallels between these physically different flow systems.