Circuts and Light Bulbs

Fire Slayer

1. The problem statement, all variables and given/known data
Two Light bulbs, one rated 30W at 120V and another rated 40W at 120V are arranged in two different circuits.
a) they bulbs are connected in parallel to a 120V source

determine the resistance and current in both bulbs.

b) determine the resistance and current if they are connected in series


2. Relevant equations
P=IV

V=IR


3. The attempt at a solution

I took the power over the voltage to find the current and then plugged that in to V=IR, but how does the voltage and current differ when it splits, or when it is in series?

RadiationX

The load voltages for a parallel configuration is the same across each load. Each light in the parallel configuration has the same voltage.

For a series configuration the load voltages add to equal the source voltage.