# Homework Help: Power over current source and resistor in series

1. Nov 6, 2011

### mkerikss

Problem description:

The problem is Kotitehtävä 7 in the attachement. The idea is to calculate the output power (both P and Q) of the current source.

Attempt:

I know the current through the current source (obviously) and want to calculate the voltage over it to get the power. I have calculated the voltage over the RJC part of the circuit. It is 0,832$\angle-33,69°$ V. The voltage over the resistor and current source is the same, but then I figured that all the voltage will be over the resistor, since the current source doesn't have any impedance. So now I'm stuck. How can I solve this problem?

File size:
51 KB
Views:
149
2. Nov 6, 2011

### Staff: Mentor

If you use nodal analysis to find the voltage at the central node, then you can find the voltage across the current source since the drop across the resistor is fixed by the current source.

3. Nov 7, 2011

### mkerikss

Thanks, I'll try to do that!