Chapter 14, Problem 28P

Find the average power loss and power factor for each of the circuits whose input current and voltage are as follows:

a.	$v=60\sin (wt+{30}^{\circ })$
	$i=15\sin (wt+{60}^{\circ })$
b.	$v=-50\sin (wt+{20}^{\circ })$
	$i=-2\sin (wt+{20}^{\circ })$
c.	$v=-50\sin (wt+{80}^{\circ })$
	$i=3\cos (wt-{20}^{\circ })$
d.	$v=75\sin (wt+5^{\circ })$
	$i=0.08\sin (wt+{35}^{\circ })$