If it’s DC, the easiest way is to use a shunt resistor and measure the voltage across it, and for AC you could use a current transformer. But the advent of the Hall-effect sensor has provided us ...

The market for hall-effect current sensors market is anticipated to reach USD 1128.0 million in 2022 and increase to USD 2765.0 million between 2022 and 2032 at a CAGR of 9.4%. Consumer electronics, ...

He built this set of no-contact limit switches using a hall effect sensor. The small black package sticking out past the end of the protoboard is the sensor. It is used to detect a magnetic field.

More information: Börge Göbel et al, Orbital Hall Effect Accompanying Quantum Hall Effect: Landau Levels Cause Orbital Polarized Edge Currents, Physical Review Letters (2024). DOI: 10.1103 ...