EE 101
Handout # 1
Prof. A. El Gamal
Jan 9, 2003
Homework Assignment #1
Due:
Thursday 1/16
1.
Modelling a compact disc player.
The (left or right channel) output of a typical CD
player can be modeled as a voltage source that is able to produce voltage between

5V
and +5V and currents between

10mA and +10mA without distorting. The output
of the CD player is fed into a receiver that can be modeled as a resistance of
R
Ω.
(a) For what values of
R
is the maximum output voltage of the CD player limited
by the
±
5V voltage limit, and for what values of
R
is it limited by the
±
10mA
current limit? (Typically,
R
exceeds 10kΩ.)
(b) For
R
= 10kΩ, ±nd the maximum power in Watts that can be transferred from
the CD player (say, from the Left channel output) into the receiver (via the Left
channel CD input).
2. A typical 10MΩ 1
/
8W resistor is 7mm long. As the voltage across it is increased, which
is likely to happen ±rst:
(a) the 1
/
8W power rating is exceeded, or
(b) an arc forms from lead to lead?
Note: You can assume that the breakdown voltage of air is 700V/mm.
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 Fall '08
 PingLi
 Volt, Compact Disc, Voltage source, Compact Disc player, PSfrag replacements, CD Player, Prof. A. El Gamal

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