And from this equation, we see that if we increase the length, we increase the numerator, and so we increase our resistance. And because the resistance is high, that means the velocity will be low. On the other hand, if we increase the area, the denominator will increase, and that will decrease the resistance. And so it will increase the velocity of that current inside that wire. So this equation tells us that a wire that is thick and which is short will propagate the current at a higher velocity because the resistance will be lower. Now we can actually treat the axon as if it was that wire, and we can treat the action potential as if it was that moving electric current.