# I RC circuits multpile R's and C's

1. Apr 8, 2017

### Arman777

I have a circuit which it looks like this.

We need to write the general RC equation.Can I reduce this circuit to like $R_{eq}$ and $C_{eq}$ then solve it ?

This is not a homework question.Just need theoretical approach

2. Apr 8, 2017

### Svein

What do you want to know? The current, the transient equation or what? You have indicated a "Q" - do you want to know the charge on the capacitor, and at what point in time? Come on - be specific!

3. Apr 8, 2017

### Arman777

Like in simple one its $ε=R\frac {dQ} {dt}+\frac {Q} {C}$

4. Apr 8, 2017

### cnh1995

Right.
If you are only interested in finding 'Q' as a function of time, you can neglect the other two RC branches and go with this equation.

5. Apr 9, 2017

### Arman777

But we need general equation...I found like $Q(t)=3Cε(1-e^{\frac {-t} {RC}})$

6. Apr 9, 2017

### cnh1995

That's correct, provided Q is the total charge supplied by the battery.

7. Apr 9, 2017

Thanks