Ohm's Law Calculator

In the same circuit, the current in the conductor is proportional to the voltage at both ends of 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 the conductor is proportional to the voltage at both ends of the conductor and inversely proportional to the current passing through it, because the resistance of the conductor is a property of itself, which depends on the length, cross-sectional area, material, temperature, and humidity of the conductor (humidity is not involved in the second grade of junior high school). Even if there is no voltage at both ends and no current passes through it, its resistance is also a constant. (This constant 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, which will affect the resistance value of the resistor and must be considered.)