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The concept of the semi trailer dates back to the early 20th century. Initially, freight was transported primarily via railroads and horse-drawn wagons. However, as highways developed and the trucking industry grew, the need for more efficient cargo transport became evident. The semi trailer, which attaches to a truck tractor, allowed for greater flexibility and capacity without the need for a dedicated vehicle for every load. This innovation marked a significant turning point in freight transportation, transforming how goods were moved and fostering economic growth.


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Resistors are one of the most fundamental electrical components. They limit the flow of electric current and are measured in ohms. Resistors are critical for controlling voltage and current levels in circuits, ensuring that delicate components do not receive excessive power that could lead to damage. For example, in a simple LED circuit, resistors protect the LED by limiting the amount of current that flows through it, thus extending its lifespan.


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