What Are the Key Differences Between Water Flow and Current Flow?

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Discussion Overview

The discussion focuses on the differences between water flow and current flow, exploring analogies and limitations of these comparisons in various contexts, including simple circuits and more complex electrical phenomena.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • Some participants note that while the analogy between water flow and current flow works for simple voltage sources and resistors, it fails in more complex scenarios such as semiconductors and antennas.
  • One participant suggests that current flow can be imagined as the movement of positive charge from high to low potentials, which yields the same results as considering negative charges moving in the opposite direction.
  • Another participant points out that there is no equivalent to magnetic fields in fluid flow and questions the existence of equivalent circuit descriptions for fluids like Thevenin and Norton equivalents in electrical circuits.
  • It is mentioned that fluid flow involves concepts such as stress and turbulence, which do not have direct counterparts in electrical circuits.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness of the water flow analogy for current flow, with some agreeing on its limitations in complex systems while others explore specific aspects of the analogy without reaching a consensus.

Contextual Notes

The discussion highlights the limitations of analogies between fluid dynamics and electrical circuits, particularly in relation to complex phenomena and specific properties unique to each domain.

mysqlpress
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What are the differences between the flow of water and current flow ?

Besides the fact that the direction of current flow is opposite to the flow of e- where water molecules move in the same manner as flow of water...


many Thanks.
 
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The analogy works well with simple voltage sources and resistors, but cannot be used to model semiconductors, antennas, and many other electrical phenomena.

For simple circuits, you are totally free to imagine that the current in a wire is a movement of positive charge high potentials to low potentials. In fact, the answers you'll get are exactly the same as those you'd get when considering negative charges moving the opposite way. When you get into semiconductors, the symmetry breaks down, however.

- Warren
 
chroot said:
The analogy works well with simple voltage sources and resistors, but cannot be used to model semiconductors, antennas, and many other electrical phenomena.

For simple circuits, you are totally free to imagine that the current in a wire is a movement of positive charge high potentials to low potentials. In fact, the answers you'll get are exactly the same as those you'd get when considering negative charges moving the opposite way. When you get into semiconductors, the symmetry breaks down, however.

- Warren

Foamy water analogy? Bubbles moving opposite way to water, no?
 
mysqlpress said:
What are the differences between the flow of water and current flow ?

Besides the fact that the direction of current flow is opposite to the flow of e- where water molecules move in the same manner as flow of water...


many Thanks.

Let's see: how about there's no analogy to magnetic field in fluid flow. There's two equivalent ways to describe an electrical circuit: the Thevenin and Norton eqvuivalent circuits; I'm not sure there's anything like that for fluids. Circuits can have rectifying elements, not so in fluids. Fluid flow involves concepts like stress and turbulence, those do not occur in electrical circuits, AFAIK.
 

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