Circuit Solver: Theveninizer

In this exercise, we will expand the circuit solver to include a representation for Thevenin equivalents (you should do your work for this problem in the same file you have used in the other circuit solver exercises).

Recall that a Thevenin is a one-port consisting of a voltage source in series with a resistor:

1) Thevenin

Create a new subclass of OnePort called Thevenin to represent a Thevenin.

Your new class should take 5 inputs:

1. A number representing the voltage across the voltage source (V_{T} above)
2. A number representing the resistance of the resistor (R_{T} above)
3. A string containing the variable name for e_1
4. A string containing the variable name for e_2
5. A string containing the variable name for i

As with all subclasses of OnePort, instances of Thevenin should contain an attribute equation.
Hint: what is the constitutive equation for this type of component?

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2) Theveninizer

Define a function thevenin_equivalent, which takes as inputs:

1. A list of components comprising a circuit
2. The variable name for the positive terminal (labeled as e_1 above; must exist in the provided circuit)
3. The variable name for the negative terminal (labeled as e_2 above; must exist in the provided circuit)
4. A variable name for the current (used in constructing the Thevenin, but does not need to exist in the provided circuit)

and returns an instance of Thevenin with the proper voltage and resistance.

In this section, you may assume that solve_circuit is already defined for you, so you may make use of it in your code; OnePort and Thevenin are also defined.

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