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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits2 Marks
Question
Germanium and silicon junction diodes are connected in parallel. A resistance R, a 12V battery, a milliammeter (mA) and key (K) are connected in series with them (figure). When key (K) is closed, a current begins to flow in the milliammeter. What will be the maximum reading of voltmeter connected across resistance R?
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Answer

The potential barrier of germanium junction diode is 0.3V and of silicon is 0.7V. Both germanium and silicon are forward biased. Therefore, for conduction the minimum potential difference across junction diode is 0.3V.
Maximum reading of voltmeter connected across R = 12 - 0.3 = 11.7V.

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