Question

Two statements are given below:
A. When the forward bias voltage across a p-n junction diode increases above a certain threshold voltage, the diode current increases significantly.
B. This current is called reverse saturation current.
Choose the correct answer from the options given below:

• A. Statement A is true, but Statement B is false
• B. Both Statements A and B are true
• C. Both Statements A and B are false
• D. Statement A is false, but Statement B is true

Hint:

Forward Current is measured in milliamperes (mA) and is due to majority carriers. Reverse Saturation Current is measured in microamperes ($\mu$A) or nanoamperes (nA) and is due to minority carriers.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
A p-n junction diode behaves differently under forward and reverse biasing. The names of the currents generated in these states are distinct.

Step 2: Detailed Explanation:
1. Statement A: In forward bias, once the applied voltage exceeds the "knee voltage" or "threshold voltage" (approx. 0.7V for Silicon), the potential barrier is overcome, and current increases exponentially. This is True. 2. Statement B: The current in forward bias is known as Forward Current. "Reverse saturation current" is the very small current that flows when the diode is reverse biased, caused by the movement of minority charge carriers. This is False.

Step 3: Final Answer:
Statement A is true, but Statement B is false.