# Understanding AC to DC conversion

I am able to see following specs on my laptop adaptor.

65 W
Input AC: 100 - 240 V, ~1.5 A, 50 - 60 Hz
Output DC: 19.5 V,  3.34 A
My HP laptop:


I am bit unclear about, the conversion of AC to DC. While this conversion takes place, Voltage gets reduced, by a significant no. of times, while current increases marginally. Why is it so ?

I am Software Engineer and knows very little about electrical engineering. Sorry for such a silly question.