i = 100mA <br /> G = G1 + G2 + G3 <br /> G = 0.02S + 0.01S + 0.002S <br /> G = 0.032S <br />
G = 1 / R <br /> V = i * R <br /> V = i / G <br /> V = 0.1A / 0.032S <br /> V = 3.125V <br />
i = V / R <br /> i = V * G <br /> i1 = 3.125V * 0.02S = 0.0625A <br /> i2 = 3.125V * 0.01S = 0.03125A <br /> i3 = 3.125V + 0.002S = 0.00625A <br />
i = i1 + i2 + i3 <br /> i = 0.0625A + 0.03125A + 0.00625A <br /> i = 0.1A <br />