Forward Bias in a Diode

Introduction:
A diode is a two-terminal semiconductor device that allows current to flow in only one direction. The flow of current through a diode depends on the polarity of the applied voltage. When the positive terminal of the battery is connected to the anode of the diode, it is known as forward bias.

Explanation:
In forward bias, the voltage applied to the diode is such that the potential difference across the diode allows the majority charge carriers to flow across the junction. The positive voltage at the anode repels the holes in the p-type material and attracts the electrons in the n-type material. This causes the depletion region to narrow, and the electric field across the junction decreases.

As a result, the diode offers very low resistance to the flow of current, and a large amount of current flows through the diode. This is because the forward bias voltage provides the energy required to overcome the potential barrier, and the majority carriers can easily cross the junction.

Advantages of Forward Bias:
1. The forward bias voltage provides the energy required to overcome the potential barrier, and the diode becomes highly conductive.
2. The forward bias voltage is the minimum voltage required to make the diode conductive.
3. The forward bias voltage is necessary for the diode to be used as a rectifier.

Conclusion:
In conclusion, when the positive terminal of the battery is connected to the anode of the diode, it is known as forward bias. This allows the majority charge carriers to flow across the junction, making the diode highly conductive. The forward bias voltage is necessary for the diode to be used as a rectifier.