Date Assigned: Tuesday, February 2, 2010 Date Due: Tuesday, February 9, 2010
Changed to Thursday, February 11
Reading:
In the Nilsson/Riedel text,
please continue to study Chapter 9, Sections 9.10, 9.11, 9.12,
and review Sections 6.4 and 6.5 on mutual inductance.
You may also find it useful to read Chapter 14 in the Bobrow
text that you used in ELEC 120.
Please begin to read Chapter 10, which we
will study during the week of February 15
(and possibly Feb. 11).
Please solve the following problems
in Chapter 9 and submit solutions in class on Feb. 9Feb. 11:
Phasor diagrams: Problem 9.82.
Linear transformers: Problems 9.73, 9.74, and 9.75.
Notes:
Problem 9.82:
In your phasor diagram, let Vs = Vm /_
0o and consider Xc = 1/(omega C) to be a fixed
number for a given frequency. Show the Vs and
Vo phasors on your diagram as Rx varies from
0 to infinity.
You do not have to include all of the phasors that are shown in the diagram in the back of the textbook.
It is enough to show Vs and the way that Vo
varies as Rx changes from 0 to infinity.
It may help if you redraw the circuit as two voltage dividers in a "bridge".
Problem 9.73: The formula for the phasor of I1 is given in the
Linear Transformer
notes from class.
You just need to plug in the numbers for the given circuit, using
M2 = k2 L1 L2.
Problem 9.74: Use the general formula for the Thevenin equivalent circuit that was
given on the whiteboard in lab on February 4.
We will discuss the derivation of the Thevenin formulas in class, but you can
solve this problem simply by plugging into the formulas.
Problem 9.75: Use the formula for Zab derived and
given on the whiteboard in lab February 4.
We will work with transformers in Lab 2
on Thursday, February 4.
All students will attend on Feb. 4, and then there is no lab on Feb. 11.
The problems on Homework 4
are posted in case you want to get an early start as you study
Chapter 9.