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PHYS-104 - COLLEGE PHYSICS
BEHAVIORAL OBJECTIVES - UNIT II (C)
(C) = Closed Book or No Equations; (O) = Equation Sheet
(C)
A.
In regard to direct current, to be able to identify:
1.
2.
3.
4.
5.
6.
7.
the direction of conventional current and electron
flow in a given circuit
from a list of possible answers, the physical
meaning of current, EMF, voltage, power, and
resistance
the effect of material, cross-sectional area, and
length of wire on resistance
the effect of temperature on resistance
describe what occurs in a conductor when electric
current flows
advantages and disadvantages for connecting two
batteries in series and parallel as well as apply
to a practical situation
and interpret a simple circuit diagram and state
the potential difference between various points of
the circuit for batteries and resistances.
(C)
B.
For a given electrical current, be able to show how a
voltmeter and ammeter must be connected properly
between two points of the circuit using the proper
diagram and identify the type of resistance (and why)
each must have.
(C)
C.
Be able to apply Ohm's Law to:
1.
2.
(O)
D.
In regard to charge flow, be able to:
1.
2.
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solve for resistance, current and/or voltage in
terms of the other two variables
identify the answer to a practical situation, e.g.
does a toaster have a large resistance?
solve for the current, charge, and/or time of flow
in terms of the other two variables
solve for the number of electrons flowing given
charge or current.
-
(O)
E.
For resistivity problems, be able to solve for:
1.
2.
(C)
F.
the resistance, resistivity, length and/or crosssectional area (diameter) of a wire in terms of
the other variables
the new resistance, new temperature, initial
resistance at initial temperature, or temperature
coefficient of resistivity given the other
variables.
For electrical power, be able to:
1.
2.
3.
(O)
-
4.
solve for power, current and/or voltage in terms
of the other two variables
explain a practical situation, e.g., does an
appliance use up electricity?
solve P = I2R problems, for one variable in terms
of the other two
solve for the energy in joules and kwh for a given
voltage, current, and time.
LABORATORY OBJECTIVES
Creation of An Electric Current
A.
For the Creation of an Electric Current experiment, be able
to:
1.
2.
3.
4.
B.
For a given wire, be able to identify the effect on
resistance and current of the wire's:
1.
2.
3.
C.
explain the battery's role in producing charges
determine whether or not current will flow for a given
electric circuit
explain why a bulb lights up (glows) more brightly
using the particular set-up of two batteries instead of
one
relate the brightness of a bulb to charge flow. This
will be tested in lab.
diameter
length
type of material assuming other variables are not
involved. An ammeter will be used to measure current.
Apply the basic principles learned in Objectives A and B to
explain the results of a practical situation.
-
-
Read:
1.
2.
3.
College Physics, 9th ed. by Serway, Chapter 17 thru p. 605
College Physics (Schaum's) pages 297-310 in 11th ed.(pps.
265-277 in 10th ed.)
Conceptual Physics, pages 436-451 in 10th edition (pages
438-452 in 9th edition); both on reserve in LRC.
Homework:
Chapter 17, MC Q’s 9 & 10; Concept Q’s 4, 5, 6, 7, 8 & 11
Problems 1, 13, 20, 22, 28, 33, 34(a), 40*, & 59*,
Answers to Selected Even-Numbered Problems for Homework:
Multiple Choice Question #9’s correct answer is 2.0 ohms
20.
(a) 5 x 105 V
22.
6.32 Ω
28.
1.08 x 10-3/0C
34.
(a)$0.29
(b) come to class to discuss
Audio-Visual:
Simulation websites:
Law
www.walter-fendt.de/ph14e/index.html
Laboratory:
Creation of An Electric Current(7)
Batteries, Bulbs and Current(8)
Resistance in a Circuit(9)
Superconductivity Demonstrations
Investigating Electric Current(10)
Resistor Combinations:
Parallel(11)
Resistors in Series and Resistors in
Ohm’s
-
-
LABORATORY OBJECTIVES
Creation of An Electric Current
A.
For the Creation of an Electric Current experiment, be able
to:
1.
2.
3.
4.
B.
For a given wire, be able to identify the effect on
resistance and current of the wire's:
1.
2.
3.
C.
A.
explain the battery's role in producing charges
determine whether or not current will flow for a given
electric circuit
explain why a bulb lights up (glows) more brightly
using the particular set-up of two batteries instead of
one
relate the brightness of a bulb to charge flow. This
will be tested in lab.
diameter
length
type of material assuming other variables are not
involved. An ammeter will be used to measure current.
Apply the basic principles learned in Objectives A and B to
explain the results of a practical situation.
Resistance in a Circuit
For a simple circuit to be used for finding the currentvoltage relationship of a resistor (to include a light
bulb), be able to:
1.
2.
3.
4.
5.
properly connect the circuit
construct and interpret the current-voltage graph
identify the voltage and current characteristics for
two batteries in series and in parallel plus apply the
results to discuss practical situations.
plot a voltage vs. current graph to find the resistance
and power input of a light bulb and interpret
physically
hook up two dry cells in series and in parallel.
B.
For an unknown color-coded resistor be able to read its
resistance and tolerance from memory.
C.
For a given unknown resistance, be able to calculate its
resistance within 15% accuracy using any experimental method
you choose, which you will clearly outline, showing all
calculations.