"Power" / "Wattage" question

string_fire · 2006-10-05T20:06:29+00:00

Hi everybody. I have a question about "power"What is the significance of "power" in electronics? I know that itsthe voltage x the current, but how is that significant in any way?For example, when I buy a 30 watt light or my speaker is 15 watts orsomething, what does that really mean and is that wattage for myspeaker electrical wattage?Also, I read that circuits are designed for "maxiumun power" and I'veheard of power losses (that turn to heat or something). Why are theydesigned for maximum power? also what is a power loss in this meaning(its not voltage x current loss, right?)?Thank you in advance! I hope this is the right place to askNote: please give as technical and detailed an answer as you'd like /see fit. I really want to understand the concept and even though idont know a lot about the technical parts (im still a high schoolstudent!) i want to get into this stuff some day maybe.Thanks a lot!-Steven