The Forward Biased pn-Junction (Diode)

While positive terminal of a battery is linked to the anode or P-side & negative terminal to the cathode or to the N-side of a diode (PN-junction ), the diode is called to be FORWARD-BIASED.

In the diagram to follow it might be noted that the arrow points to the more negative potential in each of the case.

In diagram a below the positive terminal of a battery by a resistor is linked the anode while the cathode is associated to the neutral terminal and the condition of the forward biased is fulfilled now.

In diagram b below the negative terminal of a battery is linked to the cathode while the anode is connected through a resistor to the neutral terminal and the condition of the forward biased is fulfilled now whereas I_F means the forward conventional current which is flowing from +ve terminal to -ve terminal.     

In diagram c  indicated below the +ve volts is applied towards the anode of the diode by a resistance & cathode terminal of the diode is attached to the neutral terminal via resistance which will fulfil the condition of forward biased now. Whereby I_F indicate the forward conventional current.

In diagram d shown above the negative volts is applied to the cathode of the diode via a resistance & anode terminal of the diode is attached to the neutral terminal via resistance that will fulfil the condition of forward biased. Where I_F indicate the forward conventional current shall set up in a diode.