i think you could have some fun with this idea the op author likens voltage to pressure(o)(i) within the water analogy and your osmotic membrane(ii) functions

i think you could have some fun with this idea the op author likens voltage to pressure(o)(i) within the water analogy and your osmotic membrane(ii) functions as a sort of pressure responsive valve i'm sure there are some mental acrobatics to describe a capacitor's relationships: Q=CV; between charge(Q), capacitance(C), and pressure..er, voltage(V) using osmotic principles in place of the capacitance variable addressing the permittivity of the dialectric(iii) but you'd have to describe osmotic pressure while waving away incongruencies between the two concepts and i think you'd end up so deep into enervated analogies it would just be better to explain in direct language ;P (o) http://amasci.com/miscon/voltpres.html http://amasci.com/miscon/voltpres.html (i) http://amasci.com/miscon/voltage.html http://amasci.com/miscon/voltage.html (ii) https://en.wikipedia.org/wiki/Osmotic_pressure https://en.wikipedia.org/wiki/Osmotic_pressure (iii) https://en.wikipedia.org/wiki/Capacitance https://en.wikipedia.org/wiki/Capacitance