Professional Answer: The five key components function as a single, cohesive system. The line supports (poles/towers) elevate the entire structure. The cross-arms extend from the supports to provide a platform for the insulators, which in turn securely hold and electrically isolate the conductors. This setup allows electricity to be transmitted safely over long distances. Finally, the ground wires and lightning arresters provide a critical layer of protection for the entire system, safeguarding the conductors and other components from electrical surges and lightning strikes.