R S Bridge rectifier circuit: The voltage drop upon the resistor is positive no matter the voltage of the voltage source. Potential graph representation: Potential difference of edge R is positive no matter the potential difference in the source S. Graph Properties Reflected as Physical Properties of Engineering Systems
R S The graph is self-dual, therefore flows manifest the same property: the flow through edge R is positive no matter the flow in the flow source S R S This property in the terminology of the electronic circuit reads: the current through the resistor is positive no matter the current of the current source Graph Properties Reflected as Physical Properties of Engineering Systems
The corresponding graph is not self-dual Another voltage rectifying circuit 4 Cannot serve also as a current rectifier Graph Properties Reflected as Physical Properties of Engineering Systems