Think of a conductor like a long hallway; the longer the hallway is, the more difficult it is for people to walk through it without bumping into walls, similar to how longer wires impede the flow of electrons.

According to the laws of electrical resistance, $R = \rho \frac{L}{A}$. As electrons flow through a conductor, they collide with atoms; a longer conductor provides a longer path, increasing the number of collisions and thus increasing total resistance. Resistance is an inherent property determined by the geometry and material of the conductor, not by the external voltage or current applied.

Always remember that resistance is a 'passive' physical property (like weight or length), whereas voltage and current are 'active' circuit variables. Physical dimensions change resistance; changing the current does not change the conductor's resistance.