A damaged resistor A. may appear burned B. may have an increased resistance value.?

Some sort of destroyed resistor. Chemical.can be checked out through an ohm. D.All of the above.

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D. Different types of resistors fail in different ways. Old carbon resistors often lost resistance because burning material turns into carbon that has very little resistance. Metal film and wire-wound resistors usually go open. It is difficult, or indeterminate to measure a resistor in circuit, ie without disconnecting at least one side from the circuit where it is used.

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"The frequency response of a resistor tells us at what frequencies the resistor still acts as a pure resistor, without any significant effects associated with these other types of frequency dependent components. For this reason this parameter is chiefly of interest to people working with high frequency AC circuits, such as radio frequency (RF) engineers. "

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