graphs and networks – Trouble Understanding PageRankCentrality function

I’m doing a project in which I want to rank the nodes of a graph using page-rank centrality. The Mathematica documentation for PageRankCentrality is:

PageRankCentrality[g, α], gives a list of page-rank centralities for the vertices in the graph g and weight α.

The function would then return the page-rank centralities of all nodes in the graph. My question is, is there a version of this such that I can apply it to an unweighted graph? This function requires a parameter “α” for the weight. If I put the weight to 1 or 0 for example, would that make the graph essentially unweighted? If not, what could be a possible solution to find the page-rank centrality of all nodes?