Finding Resistance in RC Circuit

AI Thread Summary
In the discussion about finding resistance in an RC circuit, participants analyze current values over time, with specific measurements provided for various seconds. The key equation mentioned is T = RC, linking time constant to resistance and capacitance. Participants express confusion regarding the calculation of the RC constant and the initial steps needed to solve for resistance. Questions arise about whether the capacitor is charging or discharging, as this affects the current equation. The conversation emphasizes the need for clarity on the circuit's behavior to proceed with the calculations.
Matt21
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Homework Statement


In a simple RC circuit the current as a function of time behaves in the following manner:

I(5s) = 8.823
I(10s) = 7.788
I(20) = 6.065
I(30) = 4.724
I(40) = 3.679
I(50) = 2.865
I(60) = 2.231
I(70) = 1.738
I(80) = 1.353
I(90) = 1.054
I(100) = 0.821
I(110) = 0.639

Assuming that the capacitance C = 837 nF, what is the resistance R (in MΩ)?

Homework Equations


T=RC

The Attempt at a Solution


I have attempted this many different times. I know that the RC constant is equal to the resistance times the capacitance but I'm having trouble finding the RC constant and don't really have any idea where to start.
 
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Hi Matt! Welcome to PF!
Matt21 said:
I have attempted this many different times.
You should show your attempt here.
Is the capacitor charging or discharging?
What will be the equation of the current? How many unknowns will it have?
 
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