1. The problem asks whether it is faster to short circuit terminals AB to find the short-circuit current $I_{sc}$ and then determine the Thevenin voltage $V_{th}$. 2. Thevenin's theorem states that any linear circuit with voltage and current sources and resistors can be replaced at terminals AB by an equivalent voltage source $V_{th}$ in series with a resistance $R_{th}$. 3. To find $V_{th}$, you typically remove the load and calculate the open-circuit voltage at terminals AB. 4. To find $I_{sc}$, you short circuit terminals AB and calculate the current through the short. 5. Once you have $I_{sc}$ and $V_{th}$, you can find the Thevenin resistance using the formula: $$R_{th} = \frac{V_{th}}{I_{sc}}$$ 6. Short circuiting terminals AB first to find $I_{sc}$ can be faster in some cases because it directly gives the current without needing to analyze the open-circuit voltage first. 7. However, depending on the circuit complexity, sometimes finding $V_{th}$ first is easier. 8. Both methods are valid and the choice depends on the specific circuit and which calculation is simpler. 9. In summary, short circuiting terminals AB to find $I_{sc}$ first and then calculating $V_{th}$ is a valid and sometimes faster approach to find Thevenin equivalent parameters.