Electrical

Measuring High Current with Shunt Resistors

Electrical Diagrams · made in Skemio

Ladder circuit diagram showing a 12V DC source powering a 10 milliohm shunt resistor and motor load on one rung, with a parallel voltmeter sensing voltage drop.
Ladder circuit diagram showing a 12V DC source powering a 10 milliohm shunt resistor and motor load on one rung, with a parallel voltmeter sensing voltage drop.
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What it shows

  • Sub-ohm shunt resistor produces predictable millivolt drops.
  • Kelvin 4-wire connections bypass lead and contact resistance.
  • Differential amplifier translates millivolt readings to digital ADC.

The takeaway

Measuring millivolts across a calibrated sub-ohm shunt yields precision high-current data safely.

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