Incandescent lightbulbs, like the ones used in many flashlights, act as resistors, and t...

Incandescent lightbulbs, like the ones used in many flashlights, act as resistors, and their light intensity depends on the current: a high current produces a high light intensity, while a small current gives a small light intensity. Figure 19.25 shows two circuits with identical batteries and identical lightbulbs (each with resistance R). In which circuit do the lightbulbs shine brightest?

(reference figure 19.25)