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dc is an abbreviation for direct current. The term dc current is sort of wrong it's a bit like saying something twice for no reason.

It might be better to say dc electricity rather than dc current.

Answer

In electrical engineering, it is normal to use the terms, 'd.c. current' and 'd.c. voltage', because the abbreviation, 'd.c.' is considered to be an adjective. The same is true for 'a.c.', too.

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