Question

A $d.c$. battery of $V$ volt is connected to a series combination of a resistor $R$ and an ideal diode $D$ as shown in the figure below. The potential difference across $R$ will be

• A. 2V when diode is forward biased
• B. Zero when diode is forward biased
• C. V when diode is reverse biased
• D. V when diode is forward biased

Answer 1

Answer: (D)

V when diode is forward biased

Answer 2

In forward biasing, the diode conducts. for ideal junction diode, the forward resistance is zero; therefore, entire applied voltage occurs across external resistance $R$ i.e. there occurs no potential drop, so potential across $R$ is $V$ in forward biased.