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54. We start with Eq. 3376:
P
avg
=
E
rms
I
rms
cos
φ
=
E
rms
µ
E
rms
Z
¶µ
R
Z
¶
=
E
2
rms
R
Z
2
.
For a purely resistive circuit,
Z
=
R
, and this result reduces to Eq. 2723 (with
V
replaced with
E
rms
).
This is also the case for a series
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 Fall '08
 SPRUNGER
 Physics

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