Monthly Archives: April 2010

Problem 1-14: Current of A Voltage Source

Find the current passing through the voltage source:
a)
A voltage source in series with a current source
b)
A voltage source in series with a current source and other elements


Solution
a) The voltage source is in series with the current source. Since by definition a current source keeps the current passing through itself constant and the voltage source is in series with the current source, it should have the same current  10 A.
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Problem 1-13: Voltage of A Current Source


Find voltages across the current sources.
a)
A Current Source Parallel with A Voltage Source
b)
Voltage Across Parallel Elements
c)
Parallel Current and Voltage Sources
d)
Parallel Current and Voltage Sources
e)
Parallel Current and Variable Voltage Sources


Solution

In each case, the current source is parallel with a voltage source. Therefore, the voltage across the current source is equal to the voltage of the voltage source, regardless of other elements.
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Problem 1-12: Using Voltage Sources to Determine Node Voltages


Determine the power of  R_1, R_2 and  Vs_1. (Hint: there is no need to use nodal analysis; voltages between nodes can be easily found by the voltage sources.)
Voltage sources can be used to fing node voltages

Solution
KVL around the loop
 V_{R_1}= Vs_1 = 10v \rightarrow P_{R_1}=\frac{V_{R_1}^2}{R_1}=50 W
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