Photos: Electric vehicles on display in DC

Even though it's two years from delivery, the 2011 Chevy Volt is must-see in any conference on electric vehicles. General Motors showed off the Volt this week at the Electric Drive Transportation Association Conference & Exposition in Washington DC.

GM calls the Volt an extended-ranged electric vehicle to distinguish it from plug-in hybrid electric cars. PHEVs run primarily from an internal combustion engine, which is augmented by battery power. An extended-range electric vehicle like the Volt or the Fisker Karma is driven by the batteries. The internal combustion engine charges a generator to replenish the batteries.