The NASCAR Xfinity Series rolls into Circuit of The Americas on Saturday for the Focused Health 250 (2:30 p.m. ET, The CW, PRN Radio, SiriusXM NASCAR Radio) for the third race of the 2025 season.

Let’s look at how it’s set up. We can see it’s a series circuit because everything is connected to one path. The power is coming from the battery, running along the wires, which are ...