Register to reply

Calculating charge on a capacitor in a DC circuit

by dancavallaro
Tags: capacitor, charge, circuit
Share this thread:
dancavallaro
#1
Jan27-09, 11:14 PM
P: 13
1. The problem statement, all variables and given/known data
See attached image for a circuit diagram. The assumptions are that transients have died out and the currents and charges have reached their equilibrium values. I have to calculate the charge on the capacitor.


2. Relevant equations
[tex]Q_C = C \Delta V[/tex]
[tex]V_C(t) = Q(t)/C = V_0(1-e^{-t/RC})[/tex]


3. The attempt at a solution
I honestly am not really sure where to start with this. Given the formula above, it's clear that I need to calculate the voltage across the capacitor. But I only know how to calculate the voltage across something with a known resistance, using Ohm's Law. I guess my first question would be, how can I calculate the voltage across a capacitor? And once I have that, I can just use [tex]Q_C = C \Delta V[/tex] to calculate the charge.

edit: nevermind, I figured this out on my own.
Attached Thumbnails
Picture1.png  
Phys.Org News Partner Science news on Phys.org
Wildfires and other burns play bigger role in climate change, professor finds
SR Labs research to expose BadUSB next week in Vegas
New study advances 'DNA revolution,' tells butterflies' evolutionary history

Register to reply

Related Discussions
Capacitor Circuit (Capacitor as source) Introductory Physics Homework 4
Can an open circuit voltage field charge a capacitor? Classical Physics 34
Capacitor charge - LRC series circuit Calculus & Beyond Homework 1
Calculating Capacitor Variance/Uncertainty Classical Physics 3
RC Circuit:placement of capacitor on circuit Introductory Physics Homework 3