I've been recently learning all about hobby electronics recently (circuit design, microcontrollers, basic components so far), so I want to give a beginner's perspective, and honestly this water pressure /flow analogy is actually really distracting and misleading as soon as you get past the basics of circuits and components.
If you're an educator please reconsider using these analogies that fall apart later on becuase in more complex concepts but the analogy may stick on in your students head when it doesn't apply. Or at least heavily stress that these are analogies and not to expect that this "water circuit" analogy will hold forever.