ABSTRACT
Within the field of study of classical physics, we can find the branch concerned with electromagnetic phenomena: electromagnetism. Electromagnetism describes the interaction between electric charges through the concepts of electric and magnetic fields. In many applications, it is possible to incorporate the current sensor on the same printed circuit board (PCB) used for placing the electronic control system. This chapter is devoted to reviewing the various techniques currently available to measure or sense the electric current intensity. The electric current corresponds to the physical phenomenon caused by the motion of electric charges, being the electric current intensity the magnitude used to describe it. An important parameter to characterize electric currents is the bandwidth. Periodic currents are usually characterized by the total harmonic distortion (THD) value. Electric current phase measurement is interesting in applications where the determination of the phase difference between the measured current and other electric magnitude is required.
