i need help with this problem:

An 980 VA, 240v, 50 Hz load has a power factor of 0.77 leading. what kind and value of a parllel element that will correct the load power factor to 0.87??

i dont know how to start in this problem
in need some help

 

General info:
http://en.wikipedia.org/wiki/Power_factor

Power factor correction:
http://www.allaboutcircuits.com/vol_2/chpt_11/4.html

 

thank u
that was usefull
but i want to ask :
if i have leading pf i should use inductive to correct the pf right ?

 

Here is an other example.

http://www.electricianeducation.com/theory/electrical_power_factor.htm

http://www.amorphousmetals.com/downloads/apps/pfc.pdf

Some more helpfull info.

http://www.engr.udayton.edu/udiac/Documents/ElecSys_PowerFactor.doc

http://www.nepsi.com/powerfactor.htm

http://www.emt-india.net/announcements/EE08_result/SanjivArora(A).pdf