In principle, the Chevrolet Volt is simple: It's an electric car with a gas-powered generator for backup. Yet the machinery under the hood is complex. The overarching goal is to wring maximum ...

But for repairs around the farm, their economical cost, light weight and ability to use 120-volt or 220-volt power supplies make them practical. A 20-Pound Arc Welder: Modern “Buzz Boxes” Lose ...