Ohm's Law and its implications

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Discussion Overview

The discussion revolves around Ohm's Law and its implications, particularly focusing on how the resistance of a wire is influenced by its length and cross-sectional area. Participants explore theoretical aspects and relationships between voltage, current, and resistivity.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants inquire how Ohm's Law accounts for the direct relationship between resistance and length, as well as the inverse relationship with cross-sectional area.
  • One participant suggests that voltage relates to length and current relates to time, proposing the equations V = EL and I = JA.
  • A later reply questions whether resistivity can be defined as the quotient of electric field (E) over current density (J).
  • Another participant references external wiki pages for further clarification on Ohm's Law and resistivity, indicating a search for more comprehensive formulations.

Areas of Agreement / Disagreement

Participants appear to be exploring similar questions regarding the relationships in Ohm's Law, but there is no consensus on the definitions or implications of resistivity and its relation to the other variables discussed.

Contextual Notes

Some assumptions regarding the definitions of voltage, current, and resistivity may be implicit in the discussion, and the references to external sources suggest that participants are seeking additional context that may not be fully addressed within the thread.

spaghetti3451
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How can Ohm's law explain the fact that the resistance of a wire depends directly on length and inversely with area?
 
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failexam said:
How can Ohm's law explain the fact that the resistance of a wire depends directly on length and inversely with area?

What are your thoughts on the question?
 
Well, the voltage has something to do with the length and the current with the time. (V= EL and I = JA). Is resistivity the quotient of E over J?
 

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