In Theatre terminology/slang, an electric means an Electrical Batten, which is the kind of batten that everything electrical is attached to (or should be attached to). This includes lamps, BSMs and usually work lamps. For brevity, the name is commonly shortened even further to just 'El'.
In most working stages, there are generally 3 Electrics (though a larger stage will require more) which are spaced evenly along the flow of the stage so that every section can be illuminated. The final upstage electric is the only one that usually carries special instruments, usually in the form of Backdrop/Cyc fill lamps.
For a short example, the phrase "Replace the lamp on Can 34 on the Second El" would be translated as "Replace the light bulb on Light 34 on the Second Electrical Batten."