Power Systems
The skin effect shows that

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

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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in same units
 base value of quantity /actual value of quantity in different units
 base value of quantity /actual value of quantity in same units
 actual value of quantity /base value of quantity in different units

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