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Think of it like a battery. The value of your vote decreases with every new vote. In other words, your 10th upvote is 20% less valuable than your 1st upvote. This battery only charges by 20% each day. So if you do 50 votes in a day, the 51st vote has 0 value. Long story short, use your vote/power judiciously.

every day its get charged to 100% again...? and does those 10 votes will be accurate with 100% power ..?

No, every day it charges only 20%. One vote is 2%, so if you do 10 upvotes a day at 100% power, your battery will be 80% at the end of the day and next day it would charge to 100%. If you do 11 upvotes, next day it will be 98% (78%+20%). These are approximate numbers but can be used as a rule of thumb. Hope it helps!

ohh thanku soo much jersey...i got it..:)