What values of resistance are offered by an ideal diode in forward and reverse biased conditions respectively?

a. zero & infinity

b. infinity & zero

c. zero & unity

d. unity & infinity

ANSWER: zero & infinity

Explanation:

Ideally, the diode operates in forward-biased condition .This is so because the current flows in forward-biased direction only when the resistance across the voltage is zero. Without any form of obstruction in the flow of current, diodes operates in forward-biasing.

On the contrary, the diode has to pass through an infinite resistance in reverse-biasing mode, which ultimately prevent it from conduction.

However, these both operating conditions of an ideal diode enable it to act as a perfect switch.