Board Thread:Questions and Answers/@comment-70.253.87.154-20130206080750/@comment-1863942-20130206122859

LV-Transformers can convert LV to and from MV.

MV-Transformers can convert MV to and from HV.

HV-Transformers can convert HV to and from EV.

Normally they convert the voltage to the lower level, however applying a redstone signal to the transformer makes them convert the voltage upwards in the opposite direction (Three dots faces the higher voltage)