Steve Erickson admits most people hold certain doubts about electric cars. He’s heard them all.“They’re all expecting that overglorified golf cart,” said Erickson, a local financial adviser. “They’re not expecting it to have power.”A demonstration at Vancouver’s Alan Webb Mazda dealership likely changed a few minds on Wednesday. A handful of electric-only cars — including the relatively rare Tesla Roadster — allowed visitors to get behind the wheel themselves, or simply hop in for a ride.Erickson, himself a Nissan Leaf driver, pulled together the demonstration to offer a chance to learn about the technology and industry, he said. Most of the attendees were Erickson’s own clients; some are already investors in the electric car industry.Nearly everyone who stepped into a vehicle gave his or her thumbs up. That was particularly true of the Tesla, which stole the show once Lance Merkin, a marketing representative for the California-based company, rolled up in a bright orange Roadster. A second Roadster, owned by a Vancouver resident, arrived later.No visitors drove the Tesla cars. But a few who climbed into the passenger seat for a joyride on nearby Highway 500 came back looking like they’d just been on a roller coaster.“Our heads went back,” said Gail Czech of Vancouver, among the first to ride. “That thing has power.”The Tesla Roadster Sport can accelerate from zero to 60 miles per hour in 3.7 seconds, powered by a lithium-ion battery in the back of the car. The car can travel almost 250 miles on a single charge. The other two models demonstrated Wednesday, the Nissan Leaf and the Mitsubishi “i,” need to plug in after less than 100 miles.