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  4. 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

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Q. 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 bePhysics Question Image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

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 occur no potential drop, but potential across $R$ is $V$ in forward biased.