The frequency of the direct current is [[1]].

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Detailed Solution

The frequency of the direct current is zero.
A direct current is a current with a constant magnitude and the same direction. A cell or a battery contains the direct current. Unlike the alternating current, the flow of direct current does not change frequently. The current electricity flows in a single direction with steady voltage. DC is mainly used to supply power to electrical devices and charge batteries. Examples: mobile phone batteries, flashlights, flat-screen television, electric vehicles, etc. DC contains the plus and minus sign, a dotted line or a straight line.
And the frequency of direct current (DC) is zero because the current only flows in one direction.

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