The gradient of a voltage-current (V-I) graph for ohmic materials represents resistance, as it reflects the change in voltage over the change in current. For these linear resistances, the gradient is consistent and equal to the ratio of voltage (V) to current (I) at any point on the graph. This relationship holds true because ohmic materials obey Ohm's Law, where resistance remains constant regardless of the voltage or current levels. Thus, the resistance can be accurately described as both the gradient and the ratio V/I. Understanding this concept is crucial for analyzing electrical circuits involving ohmic materials.
