Suggestion: a new alloy "Manganin", "Manganin is a trademarked name for an alloy of typically 86% copper, 12% manganese, and 2% nickel." For will got Manganin need smelting Manganin dust in industrial blast furnace (1000K, EU: ?, Time: ?). Manganin dust craft in workbench from 3x copper dust, 1x tiny pile of manganese, 1x tiny pile of nickel dust (shapeless craft). Manganin can use in craft Transformers (LV-Transformer, MV-Transformer, HV-Transformer, Transformer Upgrade), EU-Reader, and other devices use changing voltage. I don't think recipes for craft because it requires much time.
P.S. For new ideas http://en.wikipedia.org/wiki/Manganin