what happens to them when they put it on?
It offers power to its wearer, and progressively corrupts the wearer's mind to evil; the effect is strongly addictive.
One Ring
The Ring offers power to its wearer, and progressively corrupts the wearer's mind to evil; the effect is strongly addictive. 
lord of the rings what does the ring represent Ring of Power what is its purpose? It was forged by the Dark Lord Sauron during the Second Age to gain dominion over the free peoples of Middle-earth. where is this place located? It is the fictional setting, describing the human-inhabited world, that is, the central continent of the Earth. what are the names of the people from the place you just mentioned? Elves, Men, Dwarves, Hobbits, Ents, Orcs and Trolls, as well as various spirits, the Valar and Maiar. is the ring real? No, it is a central plot element in J. R. R. Tolkien's "The Lord of the Rings". who created it? Dark Lord Sauron when? During the Second Age how does it look? It was made simply of gold, it could change size, and perhaps its weight. does it have any special powers? Yes, its primary power was control of the other Rings of Power and domination of the wills of their users. what are people who carry the ring called? Ring-bearers what are their names? Bilbo, Frodo, and Sam
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One Ring [SEP] Addiction to power
The Ring offers power to its wearer, and progressively corrupts the wearer's mind to evil; the effect is strongly addictive. The Tolkien scholar Tom Shippey applied Lord Acton's 1887 statement that "Power tends to corrupt, and absolute power corrupts absolutely. Great men are almost always bad men" to it, noting that contemporary authors such as George Orwell with "Animal Farm" (1945), William Golding with "Lord of the Flies" (1954), and T. H. White with "The Once and Future King" (1958) similarly wrote about the corrupting effects of power.