Question

In which of the following circuit, will the bulb glows the brightest? Given that all the cells used supply equal currents.
Figure

Answer 1

Figure (a) consists of a closed circuit with three cells connected in series to form a battery. In this type of circuit, the bulb glows the brightest.

Figure (b) consists of a closed circuit with one cell connected in series. In this type of circuit, the bulb's brightness is lower than the one in figure (a).

Figure (c) consists of an open circuit with two cells connected in series. In this type of circuit, the bulb does not glow because the current will not flow.