Final answer:
The efficient transmission of electricity via high-voltage transmission lines, where higher voltages lead to reduced losses and transformers are used to adjust voltages.
Step-by-step explanation:
The question pertains to the transmission of electrical power along high-voltage transmission lines. The voltage generated by electrical power plants is increased to very high levels for transmission in order to reduce power losses along these lines. High voltage ensures that currents can be kept low, which in turn reduces thermal losses due to the resistance of the wires. Transportation of electricity is more efficient at a higher voltage (often in the range of hundreds of kilovolts) and this is achieved by means of transformers. Ceramic insulators are used to prevent the high-voltage transmission lines from grounding, and these insulators offer substantial resistance to protect the towers from electrical faults.