The screenshot is taken from the wikipedia article for a resistor - https://en.wikipedia.org/wiki/Resistor
I understand that a larger head results in greater hydrostatic pressure, therefore a greater pressure gradient (analogous to potential difference).
I take it that a clogged sink increases the "resistance" to flow due to less cross-sectional area for the fluid to move through, like how the cross-sectional area of a wire is inversely proportional to electrical resistance.
But what I don't understand is, in the hydraulic analogy, what they actually mean by "flow".
"When the pipe is clogged, it takes a larger pressure to achieve the same flow of water”.. - What does "flow" actually mean in this context?
I'm assuming it's not flow rate as I believe, in accordance with the continuity equation, that that quantity remains constant for the given system regardless of any area increase/decrease. And it can't be flow velocity as, for the clogged sink, that will surely increase. So how does the flow actually decrease?