Category Archives: Basic Concepts

Solved problems in basic concepts of electrical circuits such as Ohm’s Law, power calculation, voltage and current sources

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Problem 1-15: Power of Independent Sources


Determine the power of each source.
a)
Voltage and Current Sources
b)
Voltage and Current Sources

Solution
a) The current source keeps the current of the loop  2A and the voltage source keeps the voltage across the current source  3v as shown below.
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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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