by 
Jason
ANSWERS: 6
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The wire because it is a conductor and the outside is the insulator. Remember though that with enough energy, anything could become a conductor.
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Generally the entire cross-section of the metal conductor conducts. The exception is at high frequencies (RF or higher) there is a "skin" effect where conduction is mostly on the surface.
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All electrical current produce Electro-Motive Force. All currents produce EMF in the same orientation. Like EMF repel each other. This means that if you have two wires side by side conducting the same AC currents, that they will repel each other. Within each wire, you can think of the wire as being made up of a bundle of smaller wires. The current in each of the smaller wires will repel the other wires, or the currents in them. Thus the current flow in a wire is concentrated on the surface of the wire, as the current in the middle is repelled more than any other currents. Normally the effect is negligle, but design of high current wires is tricky.
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Generally the entire cross-section of the metal conductor conducts.Because of high frequencies it may flows through surface of the wire.Due to this losses will be increased.This is called as skin effect.
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It depends on what type of electric current you are talking of. In case of AC current,the inductance decreases from center towards the surface of the wire.As current flows through the path of least resistance,it flows through the surface of the wire which provides path of least Reactance.This phenomena where current flows through the surface due to least reactance is known as "Skin effect". . While in case of DC current the inductance part is missing as there is no change in flux with respect to time.So the resistance is same through out the conductor.Hence DC current flows through out the wire cross-section. . If,you visit any power GRID you'll see the bus bars are hollow .This is because current flows through the outer surface so bars are kept hollow to carry same current, avoiding material wastage.
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It's inside the wire. For DC (Direct Current) in typical conductor material like copper, aluminum, silver, etc., the conductor's charges are flowing distributed uniformly throughout the material. For 60Hz AC (alternating current) in typical conductor material, the current is concentrated in the outer few centimeters of the cable. So if your cable diameter is less than one cm or so, then the current flows everywhere inside.
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