The most tortured physical analogy of all time

It is with great pleasure that I present to you, ladies and gentlemen, this, the most tortured physical analogy of all time.

It will come as no surprise that this analogy is from electrical engineering, a field filled nearly to bursting with absurd fictions.

Even if you aren't familier with basic electrical circuits, have a look at this circuit diagram of a camera's flash:



Now, compare and contrast with this baffling and bafflingly unrelated diagram of a cabin's water supply:



Which part of the circuit is the ball valve? What about the other valve? Where the hell is lake superior in the circuit diagram?

Has anybody ever encountered something worse?

Ironically enough, while writing this post, I finally got the analogy. It's really not too bad!