Changes

Direct current

90 bytes removed, 17:53, March 23, 2015

Normalize categories.

[[Category:~~Energy]][[Category:Electrical Engineering~~Physics]]

[[Category:Electricity]]

[[Category:Electronics]]

[[Category:Electrical Engineering]]

[[Category:Radio]]

~~[[Category : Solar Energy]]~~

~~[[Category : Wind Energy]]~~

~~[[Category : Hydroelectric Energy]]~~

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