In response to a question in Digest # 4170, for whatever it's worth, a fuse is either good - conducting - or bad - open. When it's overloaded it blows, thereby doing its job protecting other parts. A resistor can be burned up and open or shorted but is normally of a certain value in ohms, can be fixed or variable. Good capacitors can store DC and also pass a part of an AC or pulsating DC voltage. A microprocessor is an incredibly complex device combining the functions of resistance, capacitance, and semiconductivity, built with layers of semiconducting elements. I'm not an engineer, just a repairman, and I'm sure there are better descriptions, but I hope this helps.
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