Does anyone know of a low cost "alarm device" that is triggered by a preset power amount? In other words, I need an alarm that goes off when an amount of volts or amps are present. I realize that there there are many things that I could do to inhibit the amount of current, however I would like something that actually alerts me when a preset value is exceeded. I know very little about about electrical engineering and after searching the internet I figured I'd post here. Thanks ahead of time for any help anyone has to offer.