I'm not an expert - but your SteemPower for the day is divided by the number of likes. So if you have a $1000 worth of value to give, and only make one like, that post gets the entire $1000. If you make 5 likes, then each post gets $200. It keeps going down the more you like. Undoing likes resets what your previous likes have got. And if you "rest" for 24 hours, the power restores itself.
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If you vote less than 20 times a day your STEEM power gets divided by 20. So if you vote 10 times a day each vote will still be worth 1/20 * STEEM power. For 21 or more it will be 1 / amount of votes made today.