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Exponential Change
Physics 7B  Lecture 4
Prof. Conway
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View Full Document Transport Model
•
as we have seen, a number of Fow
phenomena can be described by the
general equation
I =
Δ
V / R
fow rate
or fux
driving
potential
resistance
Examples
electrical circuit with resistor
driven by battery:
I =
E
/ R
fuid circuit driven by pump:
I =
Δ
E
pump
/ R
heat transFer between two
reservoirs:
P
=
Δ
T / R
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View Full Document Linear Transport  PRS
Which statement is not true about linear transport systems?
A. If you double the driving force (voltage, temperature
difference,.
..) , the current doubles.
B. If you double the resistance, the current is halved.
C. In linear transport systems, energy is being transformed
from one type to another.
D. For both ±uid ±ow and electrical circuits, the power
dissipated due to the resistance depends linearly on the
driving force (pump energy, battery voltage).
E. All of the other statements are true.
Steady State?
•
generalized fow (linear transport)
equations work in steady state
•
what about cases where we are not in
a steady state?
(changing systems)
•
two common kinds oF change:
exponential change
oscillations
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View Full Document Exponential Growth
•
suppose rate of growth of a population
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This note was uploaded on 03/30/2010 for the course PHY 7 taught by Professor Staff during the Spring '08 term at UC Davis.
 Spring '08
 Staff
 Resistance

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