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## Homework Statement

What is the definition of resistance?

a. Resistance is the potential difference per unit current

b. Resistance is the gradient of the graph of potential difference against current

c. Resistance is the voltage required for a current of 1 A

d. Resistance is defined by the equation R = ρL / A, where ρ is the resistivity of the material, L is the length of the wire and A is its cross sectional area

e. Resistance is the quantity that measure the ability of material to resist the current

## Homework Equations

## The Attempt at a Solution

I think the answer is between (d) or (e)

(d) is the equation that is used to define resistance and (e) is the meaning of resistance physically (maybe). How to determine which one is correct?

Thanks