The only difference between direct current and alternating current is the current.
1, alternating current is issued by the alternator, in the process of power generation, multiple pairs of magnetic poles are evenly distributed in a circle according to a certain Angle, so that in the process of power generation, each coil will cut the magnetic field line, because of the multiple pairs of magnetic poles, each pair of magnetic field line is cut by the voltage, current is changed according to the law of the string, so it can constantly produce stable current.
The frequency of domestic alternating current is generally 50 Hertz, that is, changes 50 times per second, and the frequency of alternating current in some countries is 60 Hertz, that is, changes 60 times per second. There are other frequencies, of course. Such as square waves in electronic lines, triangular, etc., but the alternating current of these waveforms is not generated by the conductor cutting the magnetic force line, but by the capacitor charging and discharging, and the switching transistor is generated when it works.
2, the direction of direct current does not change with time. Usually divided into pulsating direct current and steady current. Pulsating DC has an AC component, such as the voltage of about 300 volts in the power circuit of the color TV is the pulsating DC component can be removed by the capacitor. Constant current is more ideal, the size and direction are unchanged.
Electrolysis of water with alternating current on the same electrode sometimes parameter hydrogen, sometimes produce oxygen, that is, can not get pure gas, and it is not safe, because hydrogen and oxygen exist together is very easy to explode.
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Extended information:
Principle of direct current:
The circuit through which direct current is passed is called direct current circuit, which is a closed conductive circuit composed of DC power supply and resistance. In the direct current circuit, a constant electric field is formed.