Which device is defined by having two electrodes, a plate (anode) and a heated cathode?

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Study for the Mechatronics End-of-Pathway (EOP) Test. Explore flashcards and multiple-choice questions, each with hints and explanations. Prepare confidently for your exam!

Multiple Choice

Which device is defined by having two electrodes, a plate (anode) and a heated cathode?

Explanation:
A diode is defined by having two electrodes: a heated cathode and a plate (anode). The heated cathode emits electrons (thermionic emission). When the plate is positively biased, it attracts those electrons, allowing current to flow from the cathode to the plate in one direction. Since there’s no control grid or additional electrodes, this setup acts as a unidirectional current path, which is the essence of a diode. The other devices—triode, tetrode, and pentode—add extra electrodes (control grid, and in some cases screen and suppressor grids), giving three, four, or five electrodes and enabling amplification or switching.

A diode is defined by having two electrodes: a heated cathode and a plate (anode). The heated cathode emits electrons (thermionic emission). When the plate is positively biased, it attracts those electrons, allowing current to flow from the cathode to the plate in one direction. Since there’s no control grid or additional electrodes, this setup acts as a unidirectional current path, which is the essence of a diode. The other devices—triode, tetrode, and pentode—add extra electrodes (control grid, and in some cases screen and suppressor grids), giving three, four, or five electrodes and enabling amplification or switching.

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