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MonkderZweite@feddit.ch ⁨8⁩ ⁨months⁩ ago

If a wire were a water stream:

Volt is water pressure (fast or slow stream)
Ampere how much water there is in the stream
Watt is pressure x amount
Ohm (resistance) is how much obstructions are in the river

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ArkyonVeil@lemmy.dbzer0.com ⁨8⁩ ⁨months⁩ ago
What a straightforward and clear way to put it, thank you kindly!

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Faresh@lemmy.ml ⁨8⁩ ⁨months⁩ ago
I never got the pipe analogy. Since liquid water can’t be compressed, wouldn’t the amperes be directly proportional to the volts and to the size of the pipe, assuming there are no air bubbles? Also, supposedly resistance only reduces current, but when I think of hair in a pipe, the pressure after the obstruction would also be lower (because pressure is directly proportional to the amount of water that flows)

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- Malfeasant@lemmy.world ⁨8⁩ ⁨months⁩ ago
  
  Since liquid water can’t be compressed
  
  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…
  
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- drathvedro@lemm.ee ⁨8⁩ ⁨months⁩ ago
  It would be. By ohm’s law, I=V/R and R=V/I, so if V is fixed as V=1, then I=1/R, R=1/I, so it’s is effectively the same thing, just measured in reverse.
  
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- Gabu@lemmy.world ⁨8⁩ ⁨months⁩ ago
  www.youtube.com/watch?v=X_crwFuPht4
  
  AlphaPhoenix also has other fantastic videos explaining and experimenting with all sorts of interesting things.
  
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- Damage@feddit.it ⁨8⁩ ⁨months⁩ ago
  He expressed it wrong. Amperes is diameter of the pipe, how much volume (or charge) can be transferred per unit of length at a given pressure; Watt is the amount of water flowing out at the end, which depends both on pressure and diameter.
  
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  - Faresh@lemmy.ml ⁨8⁩ ⁨months⁩ ago
    
    Watt is the amount of water flowing out at the end
    
    Shouldn’t it instead be the sum of the kinetic energy of all water molecules that come out the other end per unit of time?
    
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    Damage@feddit.it ⁨8⁩ ⁨months⁩ ago
    Yeah, that’s not simple anymore then
    
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