Question

In a p-n junction diode, if the forward bias voltage is increased, how does the current flowing through the diode change?

• A. The current increases exponentially.
• B. The current increases linearly.
• C. The current remains constant.
• D. The current decreases exponentially.

Hint:

In a p-n junction diode, the current increases exponentially with increasing forward bias voltage, according to the diode equation.

Answer 1

The Correct Option is A

In a p-n junction diode, the relationship between the applied forward voltage and the current flowing through the diode is given by the diode equation: \[ I = I_0 \left( e^{\frac{qV}{kT}} - 1 \right) \] Where: - \( I \) is the current, - \( I_0 \) is the saturation current, - \( V \) is the forward bias voltage, - \( q \) is the charge of an electron, - \( k \) is the Boltzmann constant, - \( T \) is the temperature. As the forward bias voltage \( V \) increases, the exponential term \( e^{\frac{qV}{kT}} \) dominates, causing the current to increase exponentially. Thus, as the forward bias voltage is increased, the current flowing through the diode increases exponentially.