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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 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 $0.1\, A$ passes through resistance, then what is the voltage of the source?

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

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$V'=V+IR$
$=0.5+0.1 \times 20$
$=2.5\, V$