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## Homework Statement

We did a project in our physics class that involved a power source, a light bulb, connecting wires, a voltmeter, and an ammeter. All items were connected in a series. We were asked to raise the voltage on the power supply and measure the current across the light bulb after increasing the voltage. We were then asked to determine the mathematical expression that describes the change in resistance as a function of temperature (but we didn't measure temperature).

What is the mathematical expression?

What is the Theoretical expression the describes that relationship?

Determine the experimental resistivity of the bulb filament and compare the theoretical resistivity to your measured value.

I don't understand how we are supposed to get that "measured value" and then compare it to the theoretical resistivity... Can you explain how to get all of these calculations?