How Does Bulb Brightness Vary in Parallel and Series Circuits?

[fuschiso]

I just have a quick question, and if anyone could help, I would really appreciate it.

Two lightbulbs, one rated 30 W at 120 V and one rated 40 W at 120 V, are arranged in two different circuits (parallel and series). The power source of both circuits is 120 V.

What would the order of the bulbs be, in order of their brightness? That is, the 30 W bulb in parallel, the 40 W bulb in parallel, the 30 W bulb in series, and the 40 W bulb in series?

Thanks!

 

[robb_]

The bulb that transforms the most Power will be the brightest.

 

[m2003]

The order of the bulbs in terms of brightness would be the 40 W bulb in parallel, the 30 W bulb in parallel, the 40 W bulb in series, and the 30 W bulb in series. This is because in a parallel circuit, the voltage across each bulb remains the same, so the 40 W bulb will have a higher brightness due to its higher wattage rating. In a series circuit, the voltage is divided among the bulbs, so the 40 W bulb will also have a higher brightness compared to the 30 W bulb.