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Physics 7B
DLM 13 Overview
Model/Approach: Energy Density Model
AC6.2.3
Applying the Transport Equation to an Electric Circuit
(~ 35 min)
Learning Goals:
•
Develop understanding of electric circuits by analogy to fluid circuits.
•
Understand the transport equation as applied to electric circuits.
Act6.2.4
Making Sense of Simple Circuits
(~ 70 min)
Learning Goals:
•
Practice applying the electric transport equation to simple electric circuits.
•
Deepen understanding of the meaning of complete circuits.
•
Develop understanding of how V, I, and R “work” when there is more than one simple loop.
•
Develop understanding of relative currents in battery and bulb circuits in terms of the basic
ideas of conservation of charge and energy conservation expressed in terms of the transport
equation (
∆
V =
E
 IR).
•
Deepen awareness of one’s own way of approach to making sense of simple circuits and how
this approach is or is not consistent with the energydensity model
•
Practice changing unproductive thinking patterns to ones that are more productive
AC6.2.5
Parallel and Series Resistors
(~ 35 min)
Learning Goals:
•
Same as in 6.4.2, and in addition
•
Making use of
∆
V =
E
– IR to verify the formulas for series and parallel resistors.
•
Getting deeper understanding of resistors and batteries in series and in parallel.
•
Getting practice reducing multiple resistor circuits to a single battery and resistor.
Announcements
•
Reading Assignment
 Read Summary and Review pages 130132 and finish reading Unit 6.
•
You should be use the resources on the web page to improve your understanding of the course
materials, in particular playing with the circuits applet will help with this unit’s concepts and
solving the very many practice problems will prepare you for the exams and the final.
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View Full DocumentPhysics 7B
Activity 6.2.3
DLM 13
Applying the Transport Equation to an Electric Circuit
Your Job: Determine the Resistances
(1)
Add labeled points to the diagram and apply the
transport equation (with subscripts showing the
points where you start and stop) from one end
of the entire set of electrical resistances you
used in the previous activity to the other end.
(2)
Measure
the voltage drops across each resistor and record these
∆
V’s using the points you have
labeled on the diagram as subscripts. Also,
measure
and record the voltage drop across the entire
“string” of resistors. Record the current in the circuit.
(3)
Calculate
the value of the resistance of each resistor using the transport equation (with terms
applicable for the section between the appropriate points) and the measured values of voltage drops
and current.
Show some of your work on the board, but leave room for (5) and (6) below.
(4)
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 Spring '08
 Staff
 Energy

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