When using variation analysis on a malfunctioning circuit, which condition should also be analyzed alongside voltage or current?

When conducting variation analysis on a malfunctioning circuit, focusing on resistance is crucial because it directly impacts the flow of current through the circuit according to Ohm's law. Resistance affects how much current can flow for a given voltage, making it essential for diagnosing issues such as faulty components, poor connections, or unexpected circuit behavior.

If resistance varies from what is expected due to the materials used, temperature effects, or any degradation of components, it can lead to incorrect current readings, which can be misinterpreted in troubleshooting phases. Additionally, resistance changes may affect other parameters like voltage drops across components, leading to a cascading effect that can result in circuit failure.

While capacitance, frequency, and temperature are also important parameters to consider in circuit analysis, the immediate relationship between voltage, current, and resistance makes resistance a fundamental focus when diagnosing circuit malfunctions.