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2015-02-06T18:45:58+08:00

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Ohm's law states that the electric potenital difference between two points is proportional to the current across it. The proportionality constant is R or resistance.

V=IR

Now if you double your voltage, V->2V, the current will also be doubled.

from V=IR to 2V=(2I)R.

You can not change the resistance because it is constant.
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