1. The problem is to understand the term "Thev," which is likely a shorthand for Thevenin's theorem in electrical engineering. 2. Thevenin's theorem states that any linear electrical network with voltage and current sources and resistors can be replaced at terminals A-B by an equivalent voltage source $V_{th}$ in series with a resistance $R_{th}$. 3. To find the Thevenin equivalent, follow these steps: 1. Remove the load resistor if any, leaving terminals open. 2. Calculate the open-circuit voltage across terminals A-B; this is $V_{th}$. 3. Replace all independent voltage sources with short circuits and independent current sources with open circuits. 4. Calculate the equivalent resistance across terminals A-B; this is $R_{th}$. 4. The load can then be reconnected, connected to this simpler Thevenin equivalent circuit. 5. This simplifies analysis especially when determining load current or voltage. Final answer: Thevenin's theorem provides a method to simplify complex linear circuits to a single voltage source $V_{th}$ in series with resistance $R_{th}$ at the terminals of interest.