4
CHAPTER 1. THE CIRCUIT ABSTRACTION
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Problems
Problem 1.1 Determine the resistance of a cube with sides of length
-
cms and resistivity
Ohm-cms, when a pair of opposite surfaces are chosen as the terminals.
Problem 1.2 Sketch the
Z(
characteristic of a battery rated at 10V with an internal
resistance of 10 Ohms.
Problem 1.3 A battery rated at 7.2V and 10000 joules is connected across a lightbulb.
Assume that the internal resistance of the battery is zero. Further assume that the resis-
tance of the lightbulb is
6
.
1. Draw the circuit containing the battery and the lightbulb and label the terminal
variables for the battery and the lightbulb according to the associated variables dis-
cipline.
2. What is the power into the lightbulb?
3. Determine the power into the battery.
4. Show that the sum of the power into the battery and the power into the bulb is zero.
5. How long will the battery last in the circuit?
Problem 1.4 A sinusoidal voltage source
4
is connected across a 1k resistor.
1. Make a sketch of
%
, the instantaneous power supplied by the source.
2. Determine the average power supplied by the source.
3. Now, suppose that a square wave generator is used as the source. If the square wave
signal has a peak-to-peak of 20V and a zero average value, determine the average
power supplied by the source.
4. Next, if the square wave signal has a peak-to-peak of 20V and a 10V average value,
determine the average power supplied by the source.
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sciotech2015-06-22很好的书籍，帮助初学者
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qq_290026292015-07-08书籍很不错，帮助很大。
