Question

For the given circuit of P-N junction diode which is correct:

A. In F.B the voltage across R is V.
B. In R.B the voltage across R is V.
C. In F.B the voltage across R is 2V.
D. In R.B the voltage across R is 2V.

Answer 1

Hint: The above problem can be resolved using the voltage and current relation, commonly known as Ohm’s law. Moreover, the concepts of junction diodes and its condition of forward biasing as well as reverse Biasing is to be applied.


Complete step-by-step answer
Given:
The circuit for the P-N junction diode.
In the given P-N junction diode, if we consider the case for the forward biasing then the resistance of the P-N junction diode is very less for the magnitude of current flowing through the junction. As the resistance is low, then there will be the voltage across the resistance continuously. Hence this creates the magnitude of voltage to be as V for the given resistance R.
Therefore, in forward biasing the voltage across R is V and option A is correct.


Note: To resolve the given condition, one must be clear about the fundamentals of forward biasing as well as reverse biasing for the various junction diodes. Moreover, the appropriate condition for the drop in voltage as well as current across the junction diodes is to be analysed and remembered. One can use the Ohm’s law to predict the voltage and current drops across the various junction diodes significantly.