Hai,(adsbygoogle = window.adsbygoogle || []).push({});

I have the following circuit:

[PLAIN]http://img152.imageshack.us/img152/1848/powertransfer.png [Broken]

My task is to calculate the power dissipated in the resistor, and also the power delivered by the V1 source.

Here's what i tried.

First i /dev/null'ed the second source and calculated the impedance

[PLAIN]http://img293.imageshack.us/img293/7569/powertransferzero2.png [Broken]

[tex]\frac{1}{(1/j6)+(1/-j4)} = -J12[/tex]

This gives [tex]|Z| = 12-J12 \approx 17\ohm[/tex]

[tex]I_2 = \frac{48}{17} = 2.82A[/tex]

Then for the other source shorted:

[tex]\frac{1}{(1/12)+(1/6)} = 4[/tex]

This gives [tex]|Z| = 4-J4 \ohm \approx 5.65\ohm[/tex]

[tex]I_1 = \frac{8}{5.65} = 1.41A[/tex]

Now, do you add the currents or do you calculate the power dissipation in the resistance for

each of the voltage sources?

/James

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Basic AC power calculations

**Physics Forums | Science Articles, Homework Help, Discussion**