ABSTRACT
V = VR + j(VL −VC) From the voltage triangle the impedance triangle is derived and superimposing this on the Argand diagram gives, in complex form, impedance Z = R + j(XL − XC) or Z =|Z |∠φ where,
|Z |=√[R2 +(X L − XC)2] and φ= tan−1(X L − XC )/R When VL =VC, X L = XC and the applied voltage V
and the current I are in phase. This effect is called series reso na nce an d i s d i s cu s s ed s ep ar at el y i n C h ap t er 2 8 .
