Question

$p-n\text{junction}$ diodes are commonly used for rectification of alternating voltages. Then, which amongst the following properties of diode is responsible for this?

• A. Forward biased resistance is very low compared to reverse biased.
• B. Both options $\left(A\right)$ and $\left(B\right)$
• C. Current flow in one direction.
• D. Reverse current is independent of voltage applied.

Answer 1

The correct option is B Both options $\left(A\right)$ and $\left(B\right)$

$p-n\text{junction}$ diode allows the flow of current only in one direction.

Also, the forward biased resistance is very low as compared to reverse biased resistance.

So, if an alternating voltage is applied across a diode, the current flows only in that part of the cycle when the diode is forward biased.

This property is used to rectify alternating voltage.

Hence, option $\left(D\right)$ is the correct answer.