New York State Master Electrician Practice Exam

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Study for the New York State Master Electrician Exam. Prepare with detailed questions and thorough explanations. Boost your confidence and ace your exam!

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Which of the following is not considered a power supply?

Transformer
Inverter
Capacitor
Rectifier

The correct answer is: Capacitor

A capacitor is primarily used for energy storage and filtering in electrical circuits, rather than serving as a power supply. While capacitors can temporarily store electrical energy and release it, they do not convert or provide electrical power on their own. The main function of capacitors is to stabilize voltage levels and smooth out fluctuations in power supply systems, particularly in conjunction with other components. In contrast, a transformer is used to change voltage levels, an inverter converts DC to AC power, and a rectifier transforms AC into DC power. Each of these components plays an essential role in supplying power in various electrical systems, making them integral to energy delivery and transformation processes. Therefore, among the options provided, the capacitor stands out as the component that does not fit the definition of a power supply.