In a p-n junction diode, what happens when it is forward biased?
Practice Questions
Q1
In a p-n junction diode, what happens when it is forward biased?
Depletion region widens
Current flows easily
No current flows
Reverse breakdown occurs
Questions & Step-by-Step Solutions
In a p-n junction diode, what happens when it is forward biased?
Correct Answer: Depletion region narrows, current flows easily.
Step 1: Understand what a p-n junction diode is. It has two parts: p-type (positive) and n-type (negative) semiconductors.
Step 2: Identify what forward biasing means. This occurs when the positive side of the power source is connected to the p-type side and the negative side to the n-type side.
Step 3: When the diode is forward biased, the electric field created by the power source pushes holes (positive charge carriers) from the p-side towards the n-side.
Step 4: At the same time, electrons (negative charge carriers) from the n-side are pushed towards the p-side.
Step 5: As holes and electrons move towards each other, they begin to recombine, which reduces the width of the depletion region (the area where no charge carriers are present).
Step 6: With the depletion region narrowed, it becomes easier for current to flow through the diode.
Step 7: As a result, a significant amount of current can now pass through the diode, allowing it to conduct electricity.
