Power line frequencies refer to the standard frequency at which electrical power is transmitted through power lines. In most countries, this frequency is either 50 Hz or 60 Hz, depending on regional standards. This frequency is crucial for the operation of electrical devices, as they are designed to work efficiently at these specific rates. The choice of frequency affects the design of electrical systems, including transformers and motors. For instance, 60 Hz is commonly used in North America, while 50 Hz is prevalent in Europe and many other parts of the world. Understanding these frequencies helps ensure compatibility and efficiency in electrical infrastructure.