A portable, self-contained and compact load bank of wire wound resistors utilizes wire wound resistors which are air cooled by a fan mounted in a venturi wherein the load resistors may dissipate power at up to six times their power rating. Current flow through the resistors is controlled by a transistor...http://www.google.com/patents/US5424588?utm_source=gb-gplus-sharePatent US5424588 - Self-contained, portable compact load bank and testing method; compact load bank with improved power handling capability
