The equation $$\frac{1}{r_{eq}} = \frac{1}{r_1} + \frac{1}{r_2} + ... + \frac{1}{r_n}$$ is used to calculate the equivalent resistance of multiple resistors connected in parallel. This relationship highlights that in a parallel configuration, the total or equivalent resistance decreases as more resistors are added, allowing more current to flow through the circuit. Understanding this equation is essential for analyzing electrical circuits and optimizing their performance.
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