Common misconception - it can, just not very much, so the volume change is tiny, and in practice, there's usually something else in the system that is changing volume by a larger amount- like air bubbles, or if there's anything elastic in the plumbing, it will stretch - but regardless, water absolutely can be under pressure.
resistance only reduces current, but when I think of hair in a pipe, the pressure after the obstruction would also be lower
You are correct, in electronics, resistance drops voltage (assuming the load is in series with the resistance). In fact, a cheap quick and dirty digital to analog converter uses a bunch of resistors to supply different voltages...
Bingo. All models are "wrong", good models are useful despite being "wrong". Relativity is wrong too since it can't account for anything quantum... Relativity isn't better, it's just more accurate under certain conditions - but outside of those conditions it's more complex than it needs to be, and Newton's models are good enough.
Oh no, I get why the interference happens, it's more the content of the interference that surprises me. With analog video, a white screen is basically a 15 kHZ full amplitude square wave, but HDMI is encoded so regardless of the balance of 0s and 1s in the original content, the data stream should be just noise either way.
I was a bit late - I remember trying so hard to find it when I was 16-17, but failing, then eventually hearing that it had been written by the FBI so that inexperienced troublemakers would blow themselves up before becoming a danger to anyone else... Then I found out about ammonium nitrate and how easy it was to come by, and started experimenting with it... But then Oklahoma City happened when I was about 18 or 19 and was kind of a wake up call.
Common misconception - it can, just not very much, so the volume change is tiny, and in practice, there's usually something else in the system that is changing volume by a larger amount- like air bubbles, or if there's anything elastic in the plumbing, it will stretch - but regardless, water absolutely can be under pressure.
You are correct, in electronics, resistance drops voltage (assuming the load is in series with the resistance). In fact, a cheap quick and dirty digital to analog converter uses a bunch of resistors to supply different voltages...