1. Material: Different materials have different inherent abilities to resist the flow of electricity. Conductors like copper and silver have low resistance, while insulators like rubber and glass have high resistance.

2. Length: The longer the conductor, the higher the resistance. This is because electrons have to travel a greater distance, encountering more obstacles along the way.

3. Cross-sectional Area: The thicker the conductor, the lower the resistance. This is because a larger cross-sectional area provides more space for electrons to flow through, reducing the chance of collisions.

4. Temperature: For most materials, resistance increases with increasing temperature. This is because higher temperatures cause atoms to vibrate more, making it harder for electrons to move freely.

These four factors are summarized by the following equation:

R = ρL/A

Where:

* R is resistance

* ρ (rho) is resistivity, a property of the material

* L is length

* A is cross-sectional area