hambatan total dari ketiga resistor adalah

Rtotal
= Rseri [Rparalel (R1, R2) , R3]
= Rseri [ R1.R2 / (R1 + R2) , R3]
= Rseri [ 3.2/(3+2), 4]
= Rseri [6/5, 4]
= 6/5 + 4
= 26/5
= 5,2 ohm