Metro-North’s train service in Connecticut is challenging because of a technological quirk of fate: ours is the only commuter railroad in the U.S. that operates on three modes of power… AC, DC and ...

Batteries aren't one-size-fits-all, and neither is the way they're wired to your house. Here's what you should know about AC- and DC-coupling. When we think about solar panels and batteries, we don't ...

Alternating current (AC) electrical power has been used in industrial facilities and in people’s homes since 1882. Over the years, we have come to recognize the hazards associated with AC, and safety ...

Famously, Nikola Tesla won the War of the Currents in the early days of electrification because his AC system could use transformers to minimize losses for long distance circuits. That was well before ...