Final answer:
Electricity transmission along power lines is the process of conveying electric power over distances at high voltage to minimize losses. Transformers step up the voltage at the power station and step it down at the point of use.
Step-by-step explanation:
The conveying of electricity through wires on poles over considerable distance is known as transmission along power lines. Electricity is typically transmitted at high voltage to minimize current and therefore reduce the power loss due to resistive heating that occurs as the electricity travels. When electricity is generated at a power plant, it is stepped up to very high voltages, often ranging from 120 to 700 kV, by a device called a transformer. At the point of use, another transformer steps down the voltage to a safer, more usable level for residential and commercial purposes.