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Graph Properties Reflected as Physical Properties of Engineering Systems S R 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 S R 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 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 Graph Properties Reflected as Physical Properties of Engineering Systems 4 Another voltage rectifying circuit Cannot serve also as a current rectifier The corresponding graph is not self-dual