Analog Electronics
A working diode must have

 High resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward or reverse biased

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Low input resistance as well as output resistance
Medium input resistance and high output resistance
High input resistance and low output resistance
Negligible input resistance and high output resistance

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