p33_071.pdf

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Chapter 33 - 33.71
71. (a) The impedance is
Z = E m
I
= 125 V
3 . 20 A =39 . 1Ω .
(b) From V R = IR =
E m cos φ ,weget
R = E m cos φ
I
= (125 V) cos(0 . 982 rad)
3 . 20 A
=21 . 7Ω .
(c) Since X L −
X C ∝
sin φ = sin(
0 . 982 rad), we conclude that X L <X C . The circuit is predominantly
capacitive.
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