Voltage drop due to a resistance: Determined by resistance*current Voltage drop due to an inductance: Determined by inductance*change in current/change in time Voltage drop due to a capacitance: Determined by charge stored / capacitance Assuming applied voltage is constant: Question 1: Must the voltage drop due to an inductance always fall by one volt every time the voltage drop due to a resistance goes up by one volt? My thoughts: I don't think so, not if there's a capacitance. Question 2: Must the development of the magnetic flux of circuit correspond to the increase in the voltage drop due to a resistance, or is it more properly related to the time-integrated voltage drop due to inductance? My thoughts: Basic teaching implies the former (i.e. when they say "the current produces the magnetic field"), but perhaps more advanced teachers refer to the latter (e.g. "the increase in current produces the magnetic flux at a rate proportional to the inductance"). When capacitance is ignored it would be safe to assume that decrease in the voltage drop due to inductance implies a 1-to-1 increase in the voltage drop due to resistance. Question 3: If one takes the derivative of each of the three types of voltage drops (i.e. due to resistance, inductance, and capacitance) with respect the derivative of length, which of those three quantities is useful, and if so, in what way? My thoughts: Maybe each quantity has something to do with how effects of the applied electric field are allocated at each point in the circuit?