Potential Difference Across Resistor (RC Circuit)?

[grouchy]

Homework Statement

For the RC Circuit (R = 1M Ohm, C = 1 Micro Farad and E = 30 V) find the potential difference across the resistor 10 sec after the switch is closed.

Homework Equations

V = E (1 - e^ -t/RC)

The Attempt at a Solution

I use the above equation but I get it wrong (it should be 4V) I think I might be putting in something wrong.

 

[saltine]

I think there is something wrong with your numbers and equation, because if the context is charging the capacitor with the resistor in series, the capacitor would be charged in 10 seconds, and the voltage across the resistor would have decreased to zero. But in your equation, the voltage (V) would approach 30V, so it doesn't make sense.

 

[thomate1]

I would first check to make sure that all of the values used in the equation are correct and consistent. This includes double-checking the units of each quantity (Ohms for resistance, Farads for capacitance, and Volts for potential difference). I would also check if the equation being used is appropriate for the given circuit and if any assumptions or simplifications were made in its derivation.

If the equation and values are correct, I would then check if the calculation was done correctly, paying attention to any potential errors in arithmetic or algebra. If the result still does not match the expected value of 4V, I would suggest checking the circuit setup and connections to make sure there are no errors or malfunctions.

Additionally, I would also consider other factors that may affect the potential difference, such as the initial conditions of the circuit, any external influences, and the behavior of the components over time. It may also be helpful to consult with peers or reference materials to verify the solution and identify any potential mistakes.