Two 110-V light bulbs, one "25 W" and the other "100 W", are connected in series to a 110 V source. Then:
A) the current in the 100-W bulb is greater than that in the 25-W bulb
B) the current in the 100-W bulb is less than that in the 25-W bulb
C) both bulbs will light with equal brightness
D) each bulb will have a potential difference of 55 V
E) none of the above

Question

Quizplus · Accepted Answer

When connected in series, the same current flows through both bulbs. The 25 W bulb has a higher resistance than the 100 W bulb, causing it to drop more voltage and glow dimmer. The potential difference across each bulb will not be 55 V due to their different resistances.

Two 110-V Light Bulbs, One "25 W" and the Other