8th Week: "Thevenin's Theorem - AC"

"Thevenin's Theorem"


Thevenin’s theorem is applied to ac circuits in the same way as they are to dc circuits. The only additional effort arises from the need to manipulate complex numbers. The frequency-domain version of a Thevenin equivalent circuit is depicted in Figure below, where a linear circuit is replaced by a voltage source in series with an impedance.

Example:

Learning:

• The process that are used in DC analysis is the same with the AC analysis.

Videos:

For more information, watch the video below:

That's all. Thank You for visiting my blog.

GOD Bless! :)

By:

AYALA, ARNY  S.   BSECE -3

ECE 321

Professor:

ENGR. JAY S. VILLAN, MEP - EE

7th Week: "Source Transformation - AC"

"Source Transformation"


As figure below shows, source transformation in the frequency domain involves transforming a voltage source in series with an impedance to a current source in parallel with an impedance, or vice versa.

However, we should keep the following points in mind when dealing with source transformation.

1. Note from Figure above that the arrow of the current source is directed toward the positive terminal of the voltage source.
3. Note that source transformation is not possible when R = 0, which is the case with an ideal voltage source. However, for a practical, nonideal voltage source, R = 0. Similarly, an ideal current source with R = ∞ cannot be replaced by a finite voltage source.

Example:

Learning:

• The process that are used in DC analysis is the same with the AC analysis.

Videos:

For more information, watch the video below:

That's all. Thank You for visiting my blog.

GOD Bless! :)

By:

AYALA, ARNY  S.   BSECE -3

ECE 321

Professor:

ENGR. JAY S. VILLAN, MEP - EE

6th Week: "Superposition - AC"

"Superposition Theorem"

Since ac circuits are linear, the superposition theorem applies to ac circuits the same way it applies to dc circuits. The theorem becomes important if the circuit has sources operating at different frequencies. In this case, since the impedances depend on frequency, we must have a different frequency-domain circuit for each frequency.

Steps to Apply the Superposition Principle:

1. Turn off all independent sources except one source. Find the output (voltage or current) due to that active source using nodal or mesh analysis.
2. Repeat step 1 for each of the other independent sources.
3. Find the total contribution by adding algebraically all the contributions due to the independent sources

Example:

Learning:

• The process that are used in DC analysis is the same with the AC analysis.

Videos:

For more information, watch the video below:

That's all. Thank You for visiting my blog.

GOD Bless! :)

By:

AYALA, ARNY  S.   BSECE -3

ECE 321

Professor:

ENGR. JAY S. VILLAN, MEP - EE