Discussion:
HW2 Common mistakes
(too old to reply)
[Reader] Bill Hung
2006-07-17 23:37:35 UTC
Permalink
========================
Common mistakes for HW2
========================
a. General mistake #1. Many people still didn't write the units. As stated
in the note for HW 1, no unit will mean a partially wrong answer and

will cost you point starting from HW 3. Also, remember to show some steps.
No step will cost you points starting HW3.

2.46. Many students did a nodal analysis instead of the required mesh
analysis. You lose half a point with the right answers using nodal

analysis only.

2.49. There were many different answers for finding equivalent resistance.
Please take a look at the solution.

2.51. Many people (more than half the class) didn't know how to set up
equations to solve for node voltages. Make sure you know how to find

node voltages for a circuit before your midterm. And remember to draw and
label your circuit. If your answer is wrong, your labelled circuit

will help the grader giving you partial credit.

2.66. This problem of finding the thevenin voltage and the norton
short-circuit current is a disaster. more than half of the students didn't

get this problem right.

2.81. Be sure to indicate the direction of current, and make sure the sign
(positive or negative) of the current agrees with the direction of

current.

2.47. The answer should be V1=64V and V2=32V. And many students solved for
the current instead of the node voltages as the question asked. Next

time, read the question carefully before you answer. For some reasons, all
kinds of possible wrong answers appeared in this problem even for

those who gave node voltages.

1. Many people didn't set up the correct equations for the
inductor-capacitor-independent source circuit. There were other solutions
that are

too simple. Too simple means the equations are not in terms of the node
voltages, resistors, and inductors. On top of this, many people didn't

take the derivatives to form a proper differential equations.

2. If you did not label the y-intercept, you lose points.

3. Most of the answers were just a big mess, almost everyone got marked off.

========================
3rd Edition -> 2nd Edition
========================

2.46->2.36, 2.49->2.39. 2.51->2.41, 2.61->2.31, 2.66->2.52, 2.77->2.57,
2.81->2.66, 2.85->2.68, 2.47->2.37

========================
People who did not turn in their HWs
========================

Missing HW1
~~~~~~~~~~~
HUBBARD MICHAEL VINCENT
LEVITT BONNIE ELAINE
NAVARRO JOHN ILSLEY
TALWAR VISHAL

Missing HW2
~~~~~~~~~~~
GRIFFIN ERIC BLAIR
HUBBARD MICHAEL VINCENT
LEVITT BONNIE ELAINE
LIN MOONWAY
SKOBLAR DEREK M

-Bill
[Reader] Bill Hung
2006-07-17 23:39:24 UTC
Permalink
re-posting the same message for a better text format.
-Bill

========================
Common mistakes for HW2
========================
a. General mistake #1. Many people still didn't write the units. As stated
in the note for HW 1, no unit will mean a partially wrong answer and will
cost you point starting from HW 3. Also, remember to show some steps. No
step will cost you points starting HW3.

2.46. Many students did a nodal analysis instead of the required mesh
analysis. You lose half a point with the right answers using nodal analysis
only.

2.49. There were many different answers for finding equivalent resistance.
Please take a look at the solution.

2.51. Many people (more than half the class) didn't know how to set up
equations to solve for node voltages. Make sure you know how to find node
voltages for a circuit before your midterm. And remember to draw and label
your circuit. If your answer is wrong, your labelled circuit will help the
grader giving you partial credit.

2.66. This problem of finding the thevenin voltage and the norton
short-circuit current is a disaster. more than half of the students didn't
get this problem right.

2.81. Be sure to indicate the direction of current, and make sure the sign
(positive or negative) of the current agrees with the direction of current.

2.47. The answer should be V1=64V and V2=32V. And many students solved for
the current instead of the node voltages as the question asked. Next time,
read the question carefully before you answer. For some reasons, all kinds
of possible wrong answers appeared in this problem even for those who gave
node voltages.

1. Many people didn't set up the correct equations for the
inductor-capacitor-independent source circuit. There were other solutions
that are too simple. Too simple means the equations are not in terms of the
node voltages, resistors, and inductors. On top of this, many people didn't
take the derivatives to form a proper differential equations.

2. If you did not label the y-intercept, you lose points.

3. Most of the answers were just a big mess, almost everyone got marked off.

========================
3rd Edition -> 2nd Edition
========================

2.46->2.36, 2.49->2.39. 2.51->2.41, 2.61->2.31, 2.66->2.52, 2.77->2.57,
2.81->2.66, 2.85->2.68, 2.47->2.37

========================
People who did not turn in their HW
========================

Missing HW1
~~~~~~~~~~~
HUBBARD MICHAEL VINCENT
LEVITT BONNIE ELAINE
NAVARRO JOHN ILSLEY
TALWAR VISHAL

Missing HW2
~~~~~~~~~~~
GRIFFIN ERIC BLAIR
HUBBARD MICHAEL VINCENT
LEVITT BONNIE ELAINE
LIN MOONWAY
SKOBLAR DEREK M

Loading...