Ohm's Law and its implications

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Ohm's Law illustrates that the resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. This relationship can be expressed mathematically, with voltage (V) related to electric field (E) and length (L), while current (I) is linked to current density (J) and area (A). The concept of resistivity plays a crucial role, defined as the ratio of electric field to current density. Understanding these principles helps clarify how physical dimensions of a wire affect its electrical resistance. Overall, the discussion emphasizes the fundamental relationships defined by Ohm's Law in electrical engineering.
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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?
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

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