# Power in a Series Circuit

Discussion in 'Homework Help' started by vh1n, May 16, 2010.

1. ### vh1n Thread Starter New Member

May 16, 2010
1
0
A load of 20 + j35 ohms is connected across a 220 volt source. Determine the power factor and the reactive power?

It happens that I'm absent that day when they discussed about power in series circuit.. Can anyone help me.. I have seen a formula on the internet that Reactive power = I$^{2}$ X or Q=E$^{2}$/X.. But i don't know how to use that formula.. TIA..

2. ### mik3 Senior Member

Feb 4, 2008
4,846
67
Find the total power in the load (P) and then:

Preal=P*cos(a)

Preactive=P*sin(a)

where a is the angle of the load