For the given circuit of ideal P.N junction diode which is...

For the given circuit of ideal P.N junction diode which is correct? (A) In F.B, the voltage across $R$ is $\mathrm{V}$ (B) In R.B, the voltage across $\mathrm{R}$ is $\mathrm{V}$ (C) In $\mathrm{F} \cdot \mathrm{B}$, the voltage across $\mathrm{R}$ is $-\mathrm{V}$ (D) In R.B the voltage across $R$ is $-\mathrm{V}$

For the given circuit of ideal P.N junction diode which is correct?
(A) In F.B, the voltage across $R$ is $\mathrm{V}$
(B) In R.B, the voltage across $\mathrm{R}$ is $\mathrm{V}$
(C) In $\mathrm{F} \cdot \mathrm{B}$, the voltage across $\mathrm{R}$ is $-\mathrm{V}$
(D) In R.B the voltage across $R$ is $-\mathrm{V}$

Key Concepts

Voltage Drop and Kirchhoff’s Voltage Law

In circuits involving diodes and resistors, the voltage drop across the resistor is determined by Kirchhoff’s Voltage Law, which states that the total sum of voltage gains and drops in a closed loop must be zero. Depending on whether the diode is in forward bias or reverse bias, the voltage across the resistor can vary in magnitude and sign. Understanding these voltage relationships and sign conventions is essential for analyzing the behavior of the circuit in different bias conditions.

Ideal Diode Characteristics

An ideal diode is a theoretical construct that assumes zero voltage drop across the diode when it is forward biased (acting as a perfect conductor) and infinite resistance when it is reverse biased (acting as an open circuit). This simplification aids in analyzing circuits by ignoring the small forward voltage drop present in practical diodes and focusing solely on the conduction state of the diode.

Biasing (Forward and Reverse Bias)

Biasing refers to the method of applying voltage across the diode to control its conduction state. In forward bias, the positive voltage is applied to the p-side and negative to the n-side, reducing the barrier and allowing current flow. In reverse bias, the voltage polarity is reversed, increasing the barrier and inhibiting conduction, which is pivotal in understanding how the diode behaves in different circuit conditions.

PN Junction Diode

A PN junction diode is a semiconductor device formed by joining a p-type semiconductor with an n-type semiconductor. It allows current to flow easily in one direction (forward bias) while offering high resistance in the reverse direction (reverse bias). This behavior is based on the built-in potential barrier at the junction and is fundamental to many electronic circuits.

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