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In power supply connections, high impedance can be particularly undesirable because it can lead to inefficient power delivery and voltage drops across the connections. When impedance is high, it impairs the current flow and can result in the power supply struggling to deliver the necessary voltage and current to the load. This may cause various issues such as insufficient power to devices, potential overheating of components due to higher resistance, and increased noise in the circuit due to voltage fluctuations.

For example, in systems that require stable voltage and current, like sensitive electronic devices or industrial equipment, maintaining low impedance connections is critical to ensure reliable operation. In contrast, while high impedance may have functions in other scenarios—such as in certain capacitor circuits where it can help in filter applications—its presence in power supply connections is typically detrimental, leading to inefficient performance or failure to power devices adequately. Therefore, low impedance is preferred to maintain the integrity and efficiency of power delivery in these situations.