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Copper
Copper is a conducting material, not a semiconducting one. It's perhaps the most widely used conductor because it offers the best combination of low resistivity and low cost.
Germanium and Silicon are the two most commonly known semi-conductor materials
Copper is the most commonly used conductor material in wiring, steel is also used but is much firmer and harder to bend.
steel
Most automotive wiring is stranded copper.
The most common material used for automotive pistons is an aluminum alloy.
Modern silicon transistors are by layering a semi conductor material on top of a conductor material on top of a semi conductor material. Various materials have been tried to improve the effeciency of the transistor. Most transistors these days come as part of an intergrated circuit or IC
The most commonly used conductor of electricity is copper. For larger size service conductors the most commonly used conductor for electricity is aluminum. Aluminum service conductors are used to keep the overall cost of the project lower and are lighter to work with than copper wire.
Nylon is used because of high voltage insulation characteristics. Most plastics can be used as insulators as they are a poor conductor of electricity. The selection of material depends upon how high a voltage it needs to insulate from.
There can be any number of violas in an orchestra. It most commonly depends on the conductor.
Puller is most commonly used to remove objects or to pull objects with minimum force. Pullers main object is to install automotive pulleys, bearings and gears.