 Reading:
Please continue to study Chapter 2 in the Bobrow text,
Section 2.5 (Thevenin equivalent circuit) and
Section 2.6 (superposition).
Later this week, we will begin discussing capacitors.
The relevant reading is in Sections 3.1, 3.2, and 3.3.
The concept of a time constant is very important.
 Before lab on Thursday, February 24,
please do the prelab activities that are printed
in red on
the
Lab 5 assignment that is posted on the web page.
Also, please note the date changes that are indicated in red at the
bottom of the revised
Lab 5 assignment.
All students are asked to demonstrate their R2R ladder D/A converter
by March 3, and I will collect your lab notebooks on March 3 to grade
labs 15.

Suppose you have a real (nonideal) voltage source with 10 ohm
internal resistance, as shown below.
The source is used to light a bulb, as shown.
(a) What value of resistance should the bulb have
in order for it to shine as brightly as possible?
(b) How much power is dissipated by the bulb when its
resistance has the value you specified in part (a)?
(c) How much power is dissipated by the bulb when it
has resistance 1 ohm? What about 100 ohm?
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Assume that you have a 20 volt source available and that this 20 volt
source is very good, that is, it has a negligible internal resistance.
Such a source is usually referred to as a "stiff" source.
Design a circuit that gives 10 volts open circuit with no more than
100 ohms internal resistance.
That is, your circuit should have a Thevenin model with
v_{oc} = 10 volts and R_{o} <= 100 ohms.

The voltage divider shown in circuit (A) below has been used
to convert an
ideal 10 volt source into a 5 volt source.
Please find the Thevenin model for circuit (A).
That is, find v_{oc} and R_{0} in circuit (B) so that both circuits
have the same voltage and current behavior at their terminals.
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Suppose that a voltage source (also called a power supply)
is to be designed such that it provides 12 volts when its
terminals are opencircuited (nothing connected between them).
In addition, the voltage source must be able to provide
at least 70 watts of power to a load.
What is the maximum value of R_{0} in the
Thevenin model for this source?
(The load resistance R_{L} can be assumed to be matched
to R_{0} for maximum power transfer.)
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Thank you.