Must be measuring electon drift (Score: 0) by Anonymous Coward on 2020-03-22 11:24 (#512Q8) Voltage = Current * Resistance.Change in voltage moves at the speed of light of the material used (therefore, so does change in current). For example, copper's speed is about 1/10 the speed of light in a vacuum. "The detected electric currents are approximately one million times faster than those widely used in a modern computer processor."The current is not moving at 100,000c.On the other hand, electron drift for copper is 23 μm/s. So approx. 1 million times faster would be about 23 m/s.