We have direct current when the electrons always flow in the same direction with the same current.
2.Alternating current
In this case, the flow of electrons changes direction 50 times every second. In addition, the electric current is not always the same.
The variation of any electrical parameter over a period of time is an electric signal.
The average power of alternating current is equal to the direct current that is needed to produce the same effect. In this case of an alternating sinusoidal current, the average power would be as follow:
V(ef)=V(max)/square root of 2
Alternating current can be increased or decreased by a transformer(V1/V2=n1/n2).
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