Electrical measurements offer a low-cost route for monitoring load transfer in extrusion systems, but mean motor current alone may mask changes in the screw-material-drive interaction. This study evaluated whether three-phase current distribution and current variability provide more informative descriptors than average current in a laboratory single-screw wheat extruder. Wheat with 15% moisture content was processed in an E-75 extruder driven by a 7.5 kW, 400 V induction motor at 500 rpm and approximately 115 °C in the final barrel zone. Phase currents and line-to-line voltages were recorded with a METREL MI 2883 analyzer; internally sampled RMS quantities were averaged and stored at 1 Hz. After removal of idle operation, 1397 samples for the reference/new screw and 1065 samples for the worn screw were analysed. Mean current decreased from 13.97 to 13.38 A, whereas current unbalance increased from 5.31% to 6.45% (p < 0.001; |r| = 0.44). In the auxiliary comparison, disturbed extrusion changed mean current only from 18.59 to 19.01 A (p = 0.096), while current unbalance increased from 1.31% to 3.10% (p < 0.001; |r| = 0.91). Voltage variability remained below 0.5%. The results show that current unbalance can reveal changes in electromechanical load transfer that are weakly expressed by mean current.