in the same circuit, the current in the conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor. this is ohm's law.

from the derivation of ohm's law i=u/r, r=u/i or u=ir, it cannot be said that the resistance of a conductor is proportional to the voltage at both ends and inversely proportional to the current passing through it, because the resistance of a conductor is its own properties depend on the length, cross-sectional area, material, temperature, and humidity of the conductor (humidity is not involved in the second stage of elementary school). even if there is no voltage at both ends and no current flows through it, its resistance value is a fixed value. (this fixed value can be regarded as constant under normal circumstances, because for photoresistors and thermistors, the resistance value is uncertain. for some conductors, superconductivity still exists at very low temperatures. phenomena, these will affect the resistance of the resistor and must also be considered).