Negative electrical resistance

Michal Zalewski on the lcamtuf’s thing website writes:

If you tinker with analog electronics, you might have heard that some circuits can exhibit negative resistance. This is usually followed by a current-to-voltage plot featuring some sort of a kinked curve and an assertion that this property might help the circuit designer in some way.

But what does it mean, exactly? The concept of negative resistance is interesting, counterintuitive, and explained on Wikipedia in a rather rambling way.

Check out the conditions where this is present in the post here.

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