Here's why:

* Conductors allow electric charge to flow easily through them.

* Resistance is the opposition to this flow. The higher the resistance, the more difficult it is for charge to move through the material.

* Ohm's Law relates resistance (R), voltage (V), and current (I): V = IR. This means that a higher resistance will result in a lower current for a given voltage.

Let me know if you'd like more details about resistance or other electrical concepts!