For example, if VR and VC
are voltages across R and C, respectively in an RC circuit, then the
total voltage across RC combination is 
2
2
RC
R
C
V
V
V
=
+
 and not
VR + VC since VC is p/2 out of phase of VR 6 Though in a phasor diagram, voltage and current are represented by
vectors, these quantities are not really vectors themselves They are
scalar quantities