There is a variable Vin which goes through a resistor to a node (Vo) which then branches through a diode to a 3V source or to ground through a Zener diode. I'm to sketch the graph of Vo as a function of Vin. -4V < Vin < 4V The resistor is 1K The diode is CVD model, Von is .7V, Vzener = 2.7V and Rzener = 100Ω a picture is attached. Can current flow through the Zener diode in both directions? for example when Vin = -4V through -.7V will the zener diode operate like a normal diode? and then cease operation until the reverse breakdown voltage of 2.7 through 3.7 volts is reached? at 3.7 volts i assume all current would flow through the normal diode on top due to Rzener.