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a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire

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a difference in potential that tends to give rise to an electric current.

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The potential difference (voltage) across an ideal conductor is proportional to the current through it. The constant of proportionality is called the "resistance", R.Ohm's Law is given by: V = I R where V is the potential difference between two points which include a resistance R.

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oltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points

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a measure of the resisting power of a specified material to the flow of an electric current.

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a measure of the difficulty to pass an electric current through that conductor. The inverse quantity is electrical conductance, and is the ease with which an electric current passes.