why are transformers used in long-distance power lines?

Transformers are used in long-distance power lines primarily to increase voltage levels for efficient electricity transmission. By stepping up the voltage, transformers reduce current flow, which minimizes energy losses due to resistance in the wires. This allows electricity to travel over vast distances with less power loss. At the destination, transformers step down the voltage to safe levels for distribution to homes and businesses, ensuring effective and safe energy delivery.