when we use a little,little and the little

little is used for little quantity like - 1 ltr. petrol which is enough to go somewhere and another place. a little is used for the quantity that you can understand that is enough for something you want to do like - you have a little quantity of petrol that you can hardly go somewhere you want to go nearly.. the little is used for that is equal to nothing like - you want to go somewhere nearly but your bike doesn't have that quantity of petrol which can help it to go somewhere nearly.