ohm's law to determine amp draw

[mlrman]

been searchin'....

can't seem to find out if I need to use RMS wattage or peak wattage to determine amp draw.

using the ohm's law:

RMS wattage gives me a 69.44 amp draw.....cool!

peak wattage gives me a 138.88 amp draw...TOTALLY not cool!

I know I need to address some electrical issues regardless, but I am the type of dude that wants to know the proper way to calculate this.

thanks

[chaos GT]

stick with rms wattage and you'll be doing pretty good. just keep in mind though that amps are only about 60-70% efficient.

[mlrman]

stick with rms wattage and you'll be doing pretty good. just keep in mind though that amps are only about 60-70% efficient.

HMMM....I have heard that.....it even states that on my amps' "birthsheets". So, how does that affect my calculations?? I would divide total RMS power not by 14.4, but by 60-70% of 14.4? (9.36)?

thanks chaos

[chaos GT]

HMMM....I have heard that.....it even states that on my amps' "birthsheets". So, how does that affect my calculations?? I would divide total RMS power not by 14.4, but by 60-70% of 14.4? (9.36)?

thanks chaos
correct sir

[blue06elantragt]

on the fosgate amps, it will tell the as/tested efficiency of the amp if that is what you are using