May I ask another question?
Gandalf and Galadrial have Sauron's rings, why does it not over-power them like it did men? The Dwarves were also given rings, what happened to them?
The Dwarvish Rings
Those of the Rings of Power that Sauron gave to the Dwarves to seduce them to his service. The Dwarves proved too hardy to be lured in this way, though, and the Rings did little more than increase their native lust for gold. By the end of the Third Age, Sauron had recovered three of the Seven Rings to himself, and the other four had been consumed by dragons.
The rings worn by Gandalf, Galadriel and Elrond were not forged by Sauron.
Nenya, Narya and Vilya; the only three of the Rings of Power to be made wholly outside the influence of Sauron. Their power maintained the realms of the Elves in Middle-earth until the destruction of the Ruling Ring.
Aragorn also wore a ring that was not forged by Sauron.
A gift to Barahir and his descendants by Finrod Felagund, in reward for the saving of his life in the Dagor Bragollach. The Ring was used as a token by Barahir's son Beren Erchamion when he sought Finrod's aid in the Quest of the Silmaril, and passed down by his descendants for thousands of years. It was still an heirloom of the House of Isildur in the Third Age.
They lost them in a night of heavy drinking over a card game. They were going to get take them back but no one could remember who won that last hand.