A diode current depends on how the diode is biased:
In forward bias (FB), the anode is positive and the cathode is negative. The diode conducts current easily, and a large current (denoted as IF) flows from anode to cathode with very low resistance.
In reverse bias (RB), the anode is negative and the cathode is positive. The diode blocks current, and ideally no current flows (denoted as IR≈0), except a very small leakage in practical cases.
👉 In simple terms:
Forward bias → current flows
Reverse bias → no current flows
