FILE - A police officer moves a barrier for an emergency vehicle, Oct. 9, 2024, at Mollie Kathleen Gold Mine in Cripple Creek, Colo. DENVER (AP) — A tour guide killed at a former Colorado gold ...

SparkFun’s latest tutorial shows you how to work with relays. A relay is an electrically operated switch. In this case, they’re using it to switch a 120V AC outlet. The article carries the ...