give an expression for reaistance
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Resistance. The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: If the resistance is constant over a considerable range of voltage, then Ohm's law, I = V/R, can be used to predict the behavior of the material.
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from eq. V=IR
R will be V(Potential diff.)÷I(Current)
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