vira92

can some one detailed explain me the way pa and ca work

FrazT

CA is Current Ability and is calculated by the game based on the attributes that are important for that players position.
PA is his Potential Ability which is the highest level that his CA can rise to in the game. This is hard coded into the game and under almost all circumstances, will not change.

CA can and will go up if you have the right training facilities, good coaches, training schedules, age and playing time

The higher the PA the harder it is for the player to reach his full potenetial although it is a good guide with youngsters because they have many years to improve. Older players who are still a long way off their PA will not reach it.

vira92

so if a young player has a not great ca he can still become a star if he has a low pa

FrazT

No- If a young player has a CA of 100 and a PA of 180, he can become a very good player if the conditions are right.
If an older [player ( say 27+ ) has a CA of 100 and a PA of 180 , he will have little chance of getting close to his potential.
If a young player has a CA of 100 and a PA of 120 he will be able to improve but only to the level of a fair player as he cant improve past his PA.

Mravac Kid

Also, take note that CA and PA aren't the end-all indicator of how good a player is in his position. It's quite possible for a player with much lower CA to be better than one with greater CA, as long as his skills are distributed properly. I've seen many defenders with high PA with stats very evenly spread all around, making them a decent all-round player, but not a very good defender.
Of course, you can always train them in different positions, and have one very solid player that can cover half of your team's positions...