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Finding a component using Global Id : salesforce lightning

I am new to this. Based on our project req. I have to create unique aura:id to support dynamic appending of elements. I researched on this aura:id does not support expression. Two question

  1. Can I use global id like <a id = "{! GlobalId + '_tab' + index}"> where anchor tag will be in an iteration; so that i have a unique id for each anchor tag.

  2. How can i get this unique id; the way i am using right now is

var globalId = component.getGlobalId(); globalId = globalId + "_tab0";

var activeTab = component.find(globalId);


I am getting the global id but how to find an element with global id?

Is this approach right?