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What is the formula of resistance?

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Resistance is the property of a conductor to resist the flow of charges through it. Its SI unit is ohm

 Resistance of a uniform metallic conductor is directly proportional to its length (L) and inversely proportional to the area of cross-section (A)

R\propto l$ and $\quad R \propto \frac{1}{A}$ \\ we get\\ $R \propto \frac{l}{A}$\\ or. $R=\rho \frac{l}{A}$

where ρ (rho) is a constant of proportionality and is called the electrical resistivity of the material of the conductor.

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shubham.krishnan

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