general doubt

Sort:
smitp

i got one doubt....m new to chess.com n cn nyone plz tell me whenevr v win a rated game.....on what basis do v get our ratings?For example- in 10 mins game,i get sometime 8-9 n sometime 4 sometime even 13....and when i lose i lost ma ratings more like 10,9,13....y so???plzz help