§7-7 Impedance We define the ratio of the phasor voltage to the phasor current as impedance R: V=RI or R→Z=R L:V= jaLI or V→2=jo=t (XL=OL) C: y i or →2 jaC I JaC jac =Xc C (X OC§7-7 Impedance We define the ratio of the phasor voltage to the phasor current as impedance. • • = I V Z R Z R I V R V = R I or = → = • • • • : L j L Z j L jX I V L V = j L I or = → = = • • • • :    C jX C j j C Z j C I V I or j C C V = = → = = − = • • • •     1 1 1 1 : ) C ( XC  1 = − ( X L) L =