muon2
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« on: July 28, 2016, 08:53:24 AM » |
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The most traditional form of Ohm's law is I = V / R, where I is the current, V (or E) is the electric potential (called voltage or rarely in the US electric tension), and R is the resistance. In this form one would say that the current in a wire is proportional to the applied potential (or voltage) and inversely proportional to the resistance.
Ohm's initial experiments did not identify the resistance as a separate quantity. He found that for a fixed potential the current was proportional to the cross-sectional area and inversely proportional to the length. If the translation added the phrase that I put in bold, it would be more accurate to the work done by Ohm.
dead0's memory is good, but it is an application of Ohm's law to power. The power dissipated by a resistive element in a circuit is P = I2R. If you substitute Ohm's law (I = V/R) into this equation and use E (electromotive force) for V (voltage) you get P = IE.
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