# Really Hard Circuit Question

1. Apr 13, 2005

### scorpa

Hello there!!!

I am doing a really tough physics question on circuits. I am posting link to the picture of the circuit so you can actually see what is going on

These are the questions:

a) What is the current through R1?

This one was easy I just found the total resistance of the circuit and used the equation V= IR to get a current of 2.4 A which is the answer/

b) What is the current through R4?

I have no clue how to do this one, no matter what I do I get an answer either to high to to low. The answer should be 0.8 A.

c) What is the power dissipated in R2?

I have a feeling that I can't get this one because I can't get the one before it. The answer should be 5.1W.

d) What is the total power dissipated in the circuit?

I could do this one. It's just p = iv (12.0V)(2.4A) = 29W

Oh and one more really stupid thing. When you are drawing a graph and it says to plot resistance as a function of the cross-sectional area the resistance should go on the x-axis right?

2. Apr 13, 2005