**(a)** The bulbs have equal resistance, R. The current through bulb A is divided amongst bulbs B and C equally since they have equal resistance.

Power,

$\overline{){\mathbf{P}}{\mathbf{=}}{{\mathbf{I}}}^{{\mathbf{2}}}{\mathbf{R}}}$

*Brightness* is directly proportional to the* power dissipated* by a bulb. The current through each bulb will determine the power dissipated by the bulb relative to the others.

The three bulbs in the figure are identical.**(a)** Rank the bulbs from brightest to dimmest.

Now, suppose a wire is connected between points 1 and 2.**(b)** What happens to bulb A?**(c)** What happens to bulb B?**(d)** What happens to bulb C?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Kirchhoff's Junction Rule concept. You can view video lessons to learn Kirchhoff's Junction Rule. Or if you need more Kirchhoff's Junction Rule practice, you can also practice Kirchhoff's Junction Rule practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Freedman's class at NU.