Thevenin's Equivalent Theorem
- Thévenin’s theorem, as stated for sinusoidal AC circuits, is changed only to include the term impedance instead of resistance.
- Any two-terminal linear ac network can be replaced with an equivalent circuit consisting of a voltage source and an impedance in series.
- VTh is the Open circuit voltage between the terminals a-b.
- ZTh is the impedance seen from the terminals when the independent sources are
set to zero.
**Take note that: VTh is the Open circuit voltage between the terminals a-b while ZTh is the impedance seen from the terminals when the independent sources are set to zero**
Norton's Equivalent Theorem
- The
linear circuit is replaced by a current source in parallel with an
impedance. IN is the Short circuit current
flowing between the terminals a-b when the terminals are short circuited.
- In Norton’s theorem, it states that a linear two-terminal circuit can be replaced by an equivalent circuit consisting of a current source IN in parallel with a resistor RN, where IN is the short-circuit current through the terminals and RNis the input or equivalent resistance at the terminals when the independent sources are turned off.
Thevenin and Norton equivalents are related by:
In Thevenin's and Norton's Equivalent Theorem, This is good if we are going to put concentration on a particular part of a circuit so that in other part in other way around, The circuit can be replaced by using Thevenin's equivalent.
