How to block an AC current and only get the DC componant of a signal

The discussion addresses the challenge of isolating the DC component of a current signal in a circuit where a 100A AC current source is connected in parallel with a 12V DC voltage source and a resistance. The goal is to measure only the DC part of the current crossing the resistance while blocking the AC component. Suggested solutions include using an operational amplifier to measure the voltage drop across the resistance combined with a low-pass filter to remove AC harmonics. Alternatively, a DC ammeter can be inserted in the circuit for direct DC current measurement. To detect cable disconnection in the load path, it is proposed to monitor the voltage across a parallel resistor; a significant increase in voltage indicates an open circuit. Additionally, using an inductor in series can block AC current due to its high impedance at AC frequencies while allowing DC current to pass, exploiting the frequency-dependent reactance XL = j2πfL. The circuit model includes components representing cable resistance and an audio power amplifier for simulation purposes.
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