civilext on Instagram: "Watch as a visible wave of electricity races through a wire almost instantly, revealing the true speed of electrical signals — near the speed of light. While electrons drift slowly, the voltage signal travels like a lightning-fast wave, lighting up devices in the blink of an eye. Using high-speed cameras and long circuits, this experiment makes the invisible visible, showing how electricity isn’t just moving electrons, but an electromagnetic signal propagating almost inst

Miguel Pengel on Instagram: "Why do we have step-up and step-down transformers? When electricity is generated at a power plant, the voltage (V) is stepped up before it travels through transmission lines. That’s because power depends on both voltage and current (I), and for the same power, increasing voltage means current can be much lower. Lower current is important—energy losses in transmission lines come from resistance, and those losses increase with the square of the current. So less current