current tends to travel along the outer surfaces of a conductor in a process known as skin effects. in large electric substations the high voltage buss work is sometimes hollow tubular bars so designed for that reason. electric transmission lines are made up of stranded aluminium conductors wrapped around a steel core. steel core for strength and wrapped stranded conductors for ampacity. large solid conductors imparts more resistance in the circuit, this combined with skin effects tends to restrict current flow. stranded conductors typically will have a higher ampacity due to their smaller individual size having less resistance and also each strand will have its own skin effect. there is some thoughts that stranded conductors have less heat dissipation which will serve to reduce current flow. now is it atom to atom or does each atom just bump into each successive atom to make current flow?
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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