Power Systems
The skin effect shows that

 current density is more at the surface of the condutor
 current density is more at the centre of the condutor
 the distribution of AC current is uniform through the cross section of the conductor
 current density is lower at the surface of the condutor

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Power Systems
A thermal power station needs space

 less than that required by the diesel power station of same output.
 less than that required by atomic power station of the same output.
  less than that required by hydro-power station of same capacity.
 less than that required by a gas turbine power plant of same output.

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