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  4. A diode having potential difference 0.5 V across its junction which does not depend on current, is connected in series with resistance of 20 Ω across source. If 0.1 A current passes through resistance then what is the voltage of the source?

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Q. A diode having potential difference 0.5 V across its junction which does not depend on current, is connected in series with resistance of 20 $ \Omega $ across source. If 0.1 A current passes through resistance then what is the voltage of the source?

ManipalManipal 2008Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

The circuit diagram of the given situation is shown. Since, it is a closed mesh, the voltage is
$ V=V+IR $
Given, $ V=0.5 $ volt, $ I=0.1\,\,A $ , $ R=20\Omega $
$ \therefore $ $ V=0.5+0.1\times 20 $ $ V=2.5 $ volt

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