# Ohms?

Discussion in 'Amps and Cabs [BG]' started by pizzicato16, Mar 5, 2008.

1. ### pizzicato16

Jan 24, 2008
Baltimore
Ohm's law states that in an electrical circuit, the current passing through a conductor between two points is directly proportional to the potential difference (i.e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them.

(wikipedia)

Basically, I can't wrap my brain around impedance, 4 ohms, 8 ohms, what does it all mean? I can run a cabinet at X wattage at Y ohms, or W ohms at Z wattage. I just don't get it.

2. ### projectMalamute

Jan 9, 2008
Westfield, MA, USA
3. ### capnsandwich

Jul 18, 2006
Columbus, Ohio
Usually your amp will have a rating at how many watts your head will put out at a certain resistance, or ohm. If your amp says it runs 350 watts at 8 ohms and 480 watts at 4 ohms, that means that if you run your amp into an 8 ohm cabinet then your amp will put out 350 watts. If you run your amp into a 4 ohm cab or into 2 8 ohm cabs then your amp will put out 480 watts, since 2 8 ohm cabs running parallel work together to make 4 ohms of resistance.