Share
Explore BrainMass

Current as a Function of Time for a Circuit

Let us now consider a different RC circuit. This time, the capacitor is initially charged (q(t) = q_0), and there is no source of EMF in the circuit. We will assume that the top plate of the capacitor initially holds positive charge. For this circuit, Kirchoff's loop rule gives IR + q/C = 0, or IR = -q/C.

Find the current I(t) as a function of time for this circuit.

Express your answer in terms of q_0, C, t, R, and e.

See attached file for full problem description and diagram.

Attachments

Solution Preview

Please see the attached file. 'Solution_Different_RC_Circuit_Rebeca.doc'.

Different RC Circuit
Let us consider a RC circuit. The capacitor is initially charged (q(t) = q_0), and there is no source of EMF in the circuit. We will assume that the top plate of the capacitor initially holds positive charge. For this circuit, Kirchoff's loop rule gives IR + q/C = 0, or IR = -q/C.
Find the current I(t) as a function of time for this circuit.

Express your answer in terms of q_0, C, t, R, and e.
Again i'm totally lost
I know i have to integrate something but i don't know what or how.
Thank you!!!

Solution:
The key point is that you first obtain the ...

Solution Summary

Word document attached shows the calculations for using Kirchoff's loop rule to find the current of an RC circuit.

$2.19