Version 09/18/05   EE 40 Homework Feedback from Readers in PDF Fall 05 

HW 1

1. each part worth, 0.3, all or nothing
b.  2 points all or nothing; some confusion between implementation with
logic gates and a circuit diagram with switches

2a.  Each graph worth 0.6, if the graph was flipped -0.4, no units or labels
-0.2, no values -0.2 ; THIS WAS A HUGE PROBLEM.  please remind them to LABEL
their axis and show the UNITS in parentheses, e.g. Iout (mA), they also need
to show values on both the X and Y axis, writing values at the intercepts
would also be very helpful.  Also, remind the students to plot I on the
y-axis and V on the x-axis (no points were taken off for that).  Many
students also flipped their graphs, they should check the references of Vout
and Iout on the circuit diagram.

b.  students needed Pout, Ps, and Pr, and to show conservation for each of
the 3 parts, -0.2 for each if it was wrong in magnitude.  
lots of confusion with this problem too.  students need to know a negative
number means power is delivered and positive number for power absorbed ONLY
for passive sign convention.  I don't know if they're supposed to assume
passive sign convention, but they should specify where power is delivered
and where it is absorbed.  Many students mixed up the signs and did not
specify if power was delivered or absorbed (they were docked off 0.2 for
each part).

Also, for some reason students didn't bother to at least say energy was
conserved.  some just said energy is conserved(we didn't take off credit for
these people) , but next time they should show some work