In his State of the City speech last week, New York Mayor Michael Bloomberg said he wants to add 10,000 new electric-vehicle charging stations over the next seven years. To that end, he wants the City Council to amend building codes so that 20 percent of all new parking spaces must be “wired and ready for electric vehicles.” The city can be as “wired and ready” as Bloomberg likes, but he can’t make consumers buy electric cars. More important, he can’t overcome the basic physics that have prevented battery-powered cars from being anything more than a tiny niche player in the global auto industry.