This slide illustrates important features of a current sensing circuit. Current sensing uses the properties of Ohm’s Law. To determine the amount of current flow, a sense resistor is placed in the current path. The amount of voltage drop across the resistor is proportional to the current. The current to voltage transformation is used to process the information using an Analog to Digital Converter (ADC). A small sense resistor is desired because it will dissipate little power and it will not affect the overall loading of the circuit. Because of the small sense voltage from using a small sense resistor, an amplifier is used to increase the signal for the ADC. The total current sense solution should then accurately sense current while not affecting circuit performance.