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Ohm's law revisited

  1. Dec 15, 2007 #1
    Ohm's law states that, in an electrical circuit, the current passing through a conductor between two points is directly proportional to the potential difference (i.e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them. The mathematical equation that describes this relationship is:

    I = V/R
    I realize this may be a basic question in electronics however I am looking at it in a new perspective, that of proportions.

    Can someone please aide me in comprehending what is defined as (proportional) in this Law.
    thanks
     
  2. jcsd
  3. Dec 15, 2007 #2

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    The law was formulated as V across two points is directly proportional to the current I. The constant of proportionality was called the resistance R.
     
  4. Dec 15, 2007 #3
    "Direct proportion" means that as one variable increases, the other increases (more voltage = more current).

    "Indirect proportion" means that as one variable increases, the other decreases (more resistance = less current).
     
  5. Dec 15, 2007 #4
    Thanks Noein your anwser explains what I wanted to know
     
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