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Mixed Combination of Cells

Knee voltage ...

Question

Knee voltage of threshold voltage values for Si and Ge diodes are 0.7 V and 0.3 V respectively. Let a Si and a Ge diode are connected in a circuit as shown in the figure. Then, output voltage is

A

12 V

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B

111.3 V

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C

1.7 V

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D

110 V

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Solution

The correct option is A 12 V
As supply voltage grows from 0 to 12 V over a period of time in miliseconds, as potential drops of 0.3 V appears across germanium diode, it becomes ON so, the silicon diode remains in open circuit.

$∴ V_{0} = 12 V - 0.3 V = 11.7 V \approx 12 V$

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