Current sensors

A current sensor is a device that detects electric current in a wire and generates a signal proportional to that current. ... The generated signal can be then used to display the measured current in an ammeter, or can be stored for further analysis in a data acquisition system, or can be used for the purpose of control.

Current sensors are electrical components that can be used to measure the current in cables and busbars, usually in a galvanically isolated (non-contact) manner, based on the magnetic flux density triggered by electrical currents.