p33 071

background image

71.

(a) The impedance is

Z =

E

m

I

=

125 V

3.20 A

= 39.1 Ω .

(b) From V

R

= IR =

E

m

cos φ, we g et

R =

E

m

cos φ

I

=

(125 V) cos(0.982 rad)

3.20 A

= 21.7 Ω .

(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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