Question about the Diode
simulate this circuit &ndash; Schematic created using CircuitLab
Here is a diode. If the anode is at a higher voltage than the cathode it will be forward biased and conducting or &quot;on&quot;. The anode voltage has to be about 0.7V higher than the cathode, for a silicon diode, for it to conduct.
If the anode is at a lower voltage than the cathode it will be reverse biased, not conducting and off.