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**1. The problem, statement, all variables and given/known data**

Say there are 3 bulbs of power 100W, 500W and 1000W connected in series. Which bulb will glow brighter and why? How would it be different for a parallel combination of these bulbs?

## Homework Equations

P=I^2R

P=V^2/R

I think in series combination, the 1000W bulb will glow more because power and resistance are directly related in this case, and resistance is directly related to voltage. So, the one with higher power will glow more. For parallel combination, since voltage is constant across each bulb, I think we will take current into account. Here, resistance and power are inversely related, so the one with higher power (1000W) will have less resistance and more current will flow through it so it will glow more. Is it certain that P=I2R should be used for series circuit and P=V2/R should be used for parallel circuit?

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