CBSE Class 12 · 1995 · SemiconductorsShort Answer

Draw a circuit for a p-n junction diode in forward bias. Sketch the voltage versus current graph for the same.

Solution

Forward-bias circuit: connect the p-side to the positive terminal and the n-side to the negative terminal of a battery, with a series rheostat and milliammeter and a voltmeter across the diode.
As the forward voltage is raised, the current stays small until the knee voltage (~0.7 V for Si), then increases sharply and almost linearly.

Knee at \sim 0.7 V, steep forward current beyond it.

CBSE Class 12 Board · 1995 · Subjective

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