Current Sensor

Description

The Current Sensors are resistors used to sense the current in the circuit. By measuring the voltage drop generated when the current flowing through the resistor and known resistance, current can be calculated by Ohm's Law (I = U / R). Generally, the resistance of current sensors is very small, between 1m Ω and 1 Ω, with tight tolerance and low TCR. In applications which ask for precision measurement, the resistance of terminal and the contact resistance may be higher than the nominal value of current sensor itself. Therefore, if two-terminal resistors are used, the error caused by terminals may be serious. In order to eliminate the influence of voltage drop caused by terminals (not resistive element) and obtain extremely accurate current value, four-terminal Kelvin structure resistor is recommended.