Hi. There's this nice water circuit model for electric circuits where pressure corresponds to electric potential and the (mass or volume) flow rate to electric current. In the water model, we can vary the pipe diameter along the circuit. Since water is practically incompressible, the flow rate remains constant, i.e. the flow velocity must increase when the pipe diameter decreases. Is there an electrical analog to the pipe diameter? It certainly does not correspond to a resistance, since no energy is dissipated if we assume frictionless flow. Also, which pressure is the closest analog to electric potential? I guess it must be total pressure, since it should be the same at two points of different pipe diameter (if there's no dissipative element between them) to correctly model zero voltage drop along perfect conductors, and static and dynamic pressure would not be constant individually when the flow velocity changes.