Two terminal electronic devices can be characterized by their voltage versus current (V-I) relationship. Practically this means if we apply a voltage across the terminals there will be a current through the device we can measure. Conversely, if we inject a current into the device, we can measure the voltage across its terminals. For this lab we are assuming that electromagnetic effects are not present or are insignificant. For many devices there are mathematical models that relate voltage to current. For resistors, it is Ohm's law, I = V/R, a simple linear relationship, where the slope is the reciprocal of resistance. For an ideal current source, the mathematical model is a constant. For the ideal current source, the current will be constant for any applied terminal voltage