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ECE 210 Section 1 (week beginning
1/7/2011)
1/
Power, Energy, and Ohm's Law
(No Prelab)
1.
The rating on a 12 V car battery is 100 ampere hours (for example, it will provide I amp for
100 hours or 100 amps for I hour).
Assuming the voltage remains at 12 V during a
discharge
of the battery, how much energy is stored in the battery? To what altitude could
you lift a 1000 kg automobile
if this amount
of energy were available for this purpose?
)00
A
')(
J
2
V
)(
'36005
100 0
~
l1.
%
)C
d
~

If.
3 2 l'
,
0
l,
I
.
,
432
Wl
2.
In the figure shown, let
Is
=
8 A,
R
=
3
n,
and
v.~
=
16 V.
a
R

I
c
d
+
The sources are ideal and hence maintain their
respective
values.
Find the total
power
supplied or received by the current source, the
power delivered to
R,
and the power supplied or
received by the battery. Find the voltage
Va 
Vb
=
Vllb.
You may use the fact that
I
=
,~
for a
series circuit (by Kirchhoffs Current Law).
:c
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 Spring '05
 KELLEY/SEYLER

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