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 ...

What do a Rogowski coil, a magnetic core, and a hall effect sensor ... making current measurements with an oscilloscope. Of course, you can always measure the voltage across a shunt resistor ...

shunt resistors are used to measure the current flowing through a circuit. Ideally, each of the six 12V pins should have its own shunt resistor. With the RTX 30 series, Nvidia included three shunt ...