Between the terminals of a battery, there is a continuous, stable flow of energy. This is called direct current.
- Alternating current.
The variation of any electrical parameter over a period of time is an electric signal. The tension or voltage of domestic electricity is an alternating signal because it alternates between positive and negative values. Alternating current is produced by generators, such as the ones in large electrical generating stations.
- The efficiency of alternating current.
The average power of alternating current is equal to the direct current that is needed to produce the same effect.
- Transformers.
Transformers consist of two windings made a cooper wire. If we apply an alternating current to one of them, it will produce a certain voltage in the other. The value will depend on the number of times that the cooper wire has been wrapped around each winding.
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