## Conceptual Physics (12th Edition)

Ohm's Law states that the current through a resistive circuit depends on the voltage, divided by the overall resistance. $$Current = \frac{voltage}{resistance}$$ As more devices are connected in series, the overall circuit resistance is increased, so the current goes down, as predicted by Ohm's Law. As more devices are connected in parallel, the overall circuit resistance is decreased, so the current goes up, as predicted by Ohm's Law. The answers differ because the wiring of the circuits is different.