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In constant voltage drop model diode in forward bias is considered as a ________________

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In constant voltage drop model diode in forward bias is considered as a ________________

(a) Resistor

(b) Perfect conductor

(c) Perfect insulator

(d) Capacitor

This question was addressed to me during an interview.

My question is from Constant Voltage Drop Model-1 topic in chapter Diode Circuit of Analog Circuits

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Correct choice is (b) Perfect conductor

Easy explanation: In constant voltage drop model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero. In this model at forward bias diode can be replaced as a cell and in reverse bias diode can be avoided by considering the terminals are open.

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