The power filter is a filter circuit composed of a capacitor, an inductor, and a resistor. The filter can effectively filter out the frequency of a specific frequency in the power line or frequencies outside the frequency, obtain a power signal of a specific frequency, or eliminate a power signal after a specific frequency.
Filters, as the name suggests, are devices that filter waves. "Wave" is a very broad physical concept. In the field of electronic technology, "wave" is narrowly confined to the process of describing changes in the value of various physical quantities over time. This process is converted into a time function of voltage or current through the action of various sensors, called the time waveform of various physical quantities, or signal.
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