# Homework Help: Ideal circuit with 4 resistances and one emf.

1. Nov 11, 2008

### Mike88

1. The problem statement, all variables and given/known data
In the figure below, R1 = 5.50 , R2 = 18.0 and the ideal battery has an emf E= 12.0 V.
(a) What is the size and direction of current i1? (Take right to be positive.)

(b) How much energy is dissipated by all four resistors in 1.00 min?

2. Relevant equations
I = E/R
resistive dissipation
P=i2R
P=v2/R
3. The attempt at a solution
I am having trouble trying to find the equivalent resistance to find the current i1. I know it should be in the positive direction to the right.

For part b should i just add up the dissapations for the 4 resistors?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Nov 11, 2008

### noumed

What figure? =D
For part b you are correct, P = I2R is the energy dissipated on that resistor, so you'd have to find the corresponding value of the current going through a particular resistor.

3. Nov 11, 2008

### Mike88

I forgot to attach it but i figured the problem out anyway.