What describes a diode junction that is forward biased?

A diode junction that is forward biased allows current to flow easily through it, which is why it is described as having low impedance. When a diode is forward biased, the positive voltage is applied to the anode relative to the cathode, reducing the barrier potential that typically inhibits current flow in the reverse direction. As a result, the diode conducts electricity, significantly lowering the resistance (impedance) it presents to the circuit.

In contrast, when a diode is reverse biased, it presents a very high impedance and may effectively act like an open circuit, preventing current flow. Therefore, the low impedance characteristic of a forward-biased diode is critical for its operation in electronic circuits, allowing for efficient current conduction.