Ohm’s Law
Ohm’s law states that the electric current, I flowing through a conductor is directly proportional to the potential difference across the ends of the conductor , if temperature and other physical conditions remain constant.Mathematically, Ohm’s Law is written: V = IRwhereV = potential difference [V]I = current [A]R = resistance [Ω]Ohm’s Law tells us that if a conductor is at a constant temperature, the voltage across theends of the conductor is proportional to the current. This means that if we plot voltage on they-axis of a graph and current on the x-axis of the graph, we will get a straight-line. Thegradient of the straight-line graph is then the resistance of the conductor.