Unilateral networks allow the current to flow in one direction. It helps to calculate the power, efficiency, current, voltage, and resistance of an element of an electrical circuit. The SI unit of resistance is ohms and is denoted by Ω. V = voltage, I = current and R = resistance Ohm’s law: Ohm’s law states that at a constant temperature, the current through a conductor between two points is directly proportional to the voltage across the two points. We will calculate Rth using Voc and Isc and it is given by
To find R th: Since there are Independent sources in the circuit, we can’t find Rth directly. This current is called Norton current (or) short circuit current (i sc).
To find I sc: Short the load terminals and then calculate the current flowing through it. This open-circuit voltage is called Thevenin’s voltage (V th). To find V oc: Calculate the open-circuit voltage across load terminals. Any two terminal bilateral linear DC circuits can be replaced by an equivalent circuit consisting of a voltage source and a series resistor.
