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