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The direct current (DC or "continual tidal current") is the electric charge unidirectional flow. The direct current by so originates likes the battery, the thermo-element, the solar cell, enters with the commutator type electrical machinery generator causes. Perhaps the direct current flows in a direction for example wire, but is possible and is through the semiconductor, insulators, even passes the vacuum and in the electron or the ion beam. In the direct current, the electric charge flows in the similar direction, distinguishes it and the alternating current (AC). Stipulation before is used for the direct current is the discharge tidal current. The direct current is perhaps obtained calls from the alternating current supply use current switch arrangement the rectifier, contains the permission tidal current to flow only in a direction. The electronic element (is usual) either the mechanical and electrical element (in history) the direct current is perhaps made the alternating current by the converter or the motor-generator set. The first commercial electric power transmission (by Thomas the Edison development in 19th century later periods) has used the direct current. As a result of the alternating current direct current advantage in the transformation and the transmission, the electric power release today is nearly all alternating currents. In order to apply the request direct current, for example the third rail dynamic system, the alternating current is distributed to the substation, utilizes a rectifier to transform the strength to become the direct current. Watches the tidal current war. The direct current is used the rechargeable battery, with takes the power source in the nearly all electronic system. The very great quantity direct-current strength is extremely used in the aluminum and other electrochemical process productions. The direct current is used for some railroad propelling powers, specially in urban district. The high voltage direct current is used transmission very many strengths from the remote generation stand or the interconnection alternating current strength grid. In the electrical engineering, deadline DC is a synonym is "constant". For example, the voltage stretches across the DC voltage origin to like the tidal current through the DC tidal current origin is constant. An electricity electric circuit DC explanation is all voltages and the tidal current is the constant explanation. It was possibly demonstrated that, any voltage or the current waveform possibly decompose into the DC component and a time variation component sum total. The DC component by the definition is the voltage or the tidal current mean value in all times period. The time variation component mean value is zero. DC was discovered together in many low pressure applications, specially these by the battery supplies power, possibly causes only DC, or solar energy system, because the solar cell possibly causes only DC. The most automobiles application uses DC, although the alternator is uses a rectifier to cause DC the AC equipment. The most electronic circuit requests a direct-current power supply. (Mix hydrogen and oxygen and catalyst cause electricity together using the use fuel cell and waters as by-product) and causes only DC. The most telephones connect the wire double articulation line, (between audio and video signal) (is used with internal separation voltage AC component in two wires from the voltage DC component between two wires supplies telephone power).