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Ohms law

salesm21

To anyone who can help,

I have been recently wondering about something rather simple. Why is it in ohms law does R=V/I & I=V/R? This means that voltage is proportional to both resistance and current? I know the more voltage you have the more energy is given to each coloumb of charge but why is it that when 1 volt of energy is in 1 C of charge is there 1 ohm?

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  • Hi Mitchell,

    Keep in mind that Ohm's Law and most other equations are used for simulation only and physical things are not always that simple.

    If you put 10,000 volts across a 1 ohm resistor, you won't get 10,000 amps, you'll get a melted resistor.

    Resistance will change due to environmental factors also, a hot resistor or motor windings, or... will have a different value than when it's cold.

    Capacitance is also a moving target.  Humidity will change a capacitor's value.  Inductance is its own beast, and will change value just by being close to another part/wire/magnet/etc.  Equations are for estimating and simulating things, and are rarely correct for all circumstances.

    Clear as mud??

    (If you don't believe me, try measuring the resistance of mud)

    Scott

  • in reply to rsc

    And contrary to other peoples opinion, that's why having at least a basic understanding of the fundamentals is important.

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