P28_016.PDF

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Chapter 28 - 28.16
16. (a) Let the emf of the solar cell be
E
and the output voltage be V .Thus,
V =
E−
ir =
E−
V
R
r
for both cases. Numerically, we get 0 . 10V =
E−
(0 . 10V / 500 Ω) r and 0 . 15 V =
(0 . 15 V / 1000 Ω) r.
We solve for
E
and r :
E
=0 . 30V, r =1000 Ω.
(b) The e'ciency is
V 2 /R
P received =
0 . 15 V
(1000 Ω)(5 . 0cm 2 )(2 . 0
×
10 − 3 W / cm 2 ) =2 . 3
×
10 − 3 .
E−
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