light wiring questions

[punkbek3886]

i bought some lights off of ebay, they didnt come with a relay or wiring harness. i was looking for relays, and the 12v automotive relays i found were in the 20-30 amp range. will this be alright for a pair of 55w lights? or four lights? i know how to wire up the relays, but im not sure how the ratings work. thanks for the help in advance

 

[Bill Kemp]

Check out this page. http://www.rallylights.com/other/wiring.htm
A 30 amp relay w/correct size wire will be fine for 4 55watt lamps.

 

[punkbek3886]

its kinda funny, but i asked this question just a couple days ago, and today in physics 2 lab we did experiments with circuits and i understand the whole resistance/current/power/voltage relationship. a 30 amp fuse at 12 volts is good for 360 watts. thanks for the info tho, that page is cool