Changes

They describe the voltage drop associated with current crossing a resistor, according to [http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law].  As such, there is one equation per resistor in the circuit.

They describe the voltage drop associated with current crossing a resistor, according to [http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law].  As such, there is one equation per resistor in the circuit.

* <math>R_1</math>: <math>V_b - I_1 \cdot R_1 = V_1</math>

* <math>R_1</math>: <math>V_b - I_1 \!\cdot\! R_1 = V_1</math>

* <math>R_2</math>: <math>V_2 - I_2 \cdot R_2 = 0</math>

* <math>R_2</math>: <math>V_2 - I_2 \!\cdot\! R_2 = 0</math>

* <math>R_3</math>: <math>V_4 - I_3 \cdot R_3 = V_3</math>

* <math>R_3</math>: <math>V_4 - I_3 \!\cdot\! R_3 = V_3</math>

* <math>R_4</math>: <math>V_3 - I_4 \cdot R_4 = 0</math>

* <math>R_4</math>: <math>V_3 - I_4 \!\cdot\! R_4 = 0</math>

* <math>R_5</math>: <math>V_5 - I_5 \cdot R_5 = V_4</math>

* <math>R_5</math>: <math>V_5 - I_5 \!\cdot\! R_5 = V_4</math>

* <math>R_6</math>: <math>V_c - I_6 \cdot R_6 = V_5</math>

* <math>R_6</math>: <math>V_c - I_6 \!\cdot\! R_6 = V_5</math>

* <math>R_7</math>: <math>V_c - I_7 \cdot R_7 = V_7</math>

* <math>R_7</math>: <math>V_c - I_7 \!\cdot\! R_7 = V_7</math>

* <math>R_t</math>: <math>V_{out} - I_t \cdot R_t = 0</math>

* <math>R_t</math>: <math>V_{out} - I_t \!\cdot\! R_t = 0</math>

=== Node charge flow ===

=== Node charge flow ===

: <math>\sum I = 0</math>

: <math>\sum I = 0</math>

or alternately

or alternately

: <math>\sum I_\mbox{into node} = \sum I_\mbox{out of node}</math>.

: <math>\sum I_{into} = \sum I_{out}</math>.

There is one such equation per node, and each node already is labeled on the above diagram by the voltage at that point; thus there is one equation per voltage.  Additionally, each transistor acts as a node.

 

* <math>V_2</math>: <math>I_{in} = I_2 + h_2</math>

* <math>T_2</math>: <math>k_e = k_b + k_c</math>