Power Systems
The skin effect shows that

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

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Power Systems
An hydro-graph indicates

 the average run off during the period.
All of these
 the discharge at any time during the period under consideration.
 the maximum and minimum run off during the period.

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