 Consequently, Kirchhoff's current law at the emitter provides an emitter current of "v"IN/"R"R. Using properties of the norator output portion of the nullor, the nullor provides whatever current is demanded of it, regardless of the voltage at its output.In this case, it provides the transistor base current "i"B.Thus, Kirchhoff's current law applied to the transistor as a whole provides the output current drawn through resistor "R"C as

where the base current of the bipolar transistor "i"B is normally negligible provided the transistor remains in active mode.