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Answer:
The benefits of power electronics are: High power density power supplies. Improved efficiency of up to 99% in power conversion. Noise-sensitive applications such as in medical devices are also transitioning to switching power supplies because of the efficiency and reliability.
Step-by-step explanation:
Because they have electrical cords :P But really, b/c electron movement is a convenient attribute of many elements. The electrons are "loose" on most metals, so they can conduct electricity.