Resistors (and Old Ladies) Have Hidden Depths.

Design News | November 19, 2007| | Copyright

By James Bryant

Q. You recently discussed the thermal noise of resistors. They seem to be such straightforward components with just two connections and one simple property: resistance. Do they have more traps for the unwary?

A. I recently attended the 80th birthday of a charming white-haired old lady. In conversation, I was amazed to learn of her teenage years in the French Resistance blowing up Nazi ammunition trains.

The other sort of resistance can fool you, too. A resistor's value, and its tolerance, are obvious properties. Power dissipation is ...

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