# Current, voltage, power

1. Feb 9, 2010

### -EquinoX-

1. The problem statement, all variables and given/known data

http://img69.imageshack.us/img69/3523/42317761.jpg [Broken]
http://img194.imageshack.us/img194/7240/82479056.jpg [Broken]

2. Relevant equations

3. The attempt at a solution

The answer is 400w and 1ma respectively, but how do I get to it?

Last edited by a moderator: May 4, 2017
2. Feb 9, 2010

### willem2

How much power does a current source deliver to a circuit? On what depends it?
Can you figure out what the potential of the various parts of the circuit is?

For part b:

1. introduce two unknown potentials for the two points where 3 resistances meet. The
potentials at the top and bottom of the circuit are +40 mv and 0.

2. compute the currents in all five resistors as a function of the 2 unknown potentials

3. use Kirchhofs current rule in the points with unknown potential from step 1 to set up 2 equations for the unknown potentials

4. solve the equations

5. compute any current needed for the answer

3. Feb 9, 2010

### -EquinoX-

for part a should I simplify the circuit? otherwise I am still lost on how to do it

and I am even more confused by your explanation in part b, which one are you referring when you say potential at top and bottom?