Question

I am working on a lab for physics where we have phet capacitor lab with the light bulb. I have to find the resistance of the light bulb. Trials consist of changing the separation of the plates while  timing how long it takes for the capacitor to discharge. I have the capacitance charge on the plates and voltages. How can I figure out the resistance of the lightbulb?

Answer 1

If you are have the capacitance charge on the palte and voltage . So tha time at which the voltage is drop to V/e is called time constant.

For series rc circuit its value is R*C.

By knowing capacitance and time constant you get your resistance of the bulb.

Capacitance is given as ( maximum charge)/ (maximum voltage ).

And time constat you will get from voltage vs time graph .

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