Sorry Fran, check the site at https://www.roland.com/global/products/ba-330/specifications/

410 milliamperes is only 4.1-watts. That's it! Nothing complicated about OHM's law when it comes to calculating wattage.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)