Hey guys, I'm currently having some trouble regarding the water pipe systems. The problem arose as I was exploring analogies for the electrical circuit. Alright firstly, in a water pipe, we need pressure difference for the water to flow, right? Okay, not necessary, as long as initially the water is flowing, it can flow across pipes which are ideal and without resistance. Can this explain why current flow even in ideal wires of electrical circuits which do not have resistance? Or do we stick to the fact that in reality, wires have resistance, hence there is a potential difference between the 2 ends of the wire, hence current flows? Does Poiseulle's Law for water flow rate applies when water in a pipe flows from a constricted section to a wide section and vice versa? If so, it seems weird that the flow rate is dependent on the pressure difference, by Poiseulle's Law, and the pressure difference is dependent on the flowrate, by Bernoulli's Law. So how do we go about working out the calculations if we do indeed face problems regarding water flowing from one section to another which are of different radius?