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Vacuum tubes are generally not considered ohmic devices. Ohmic materials exhibit a linear relationship between voltage and current, described by Ohm's law (V = IR). In contrast, vacuum tubes operate based on thermionic emission and can exhibit nonlinear characteristics, meaning their current-voltage relationship can vary based on factors like temperature and applied voltage. Thus, they do not maintain a constant resistance across different operating conditions.

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AnswerBot

1d ago

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