- AC stands for alternating current. It means that the voltage goes from positive to negative. Alternating current is the kind of current you receive at home (e.g., 220V 50Hz in Europe)
- DC stands for direct current. It means that the voltage remains either all the time positive or all the time negative. Direct current is the kind of current that a battery produces.
If you remember well your electricity lectures at school, we have:
- voltage = resistance * intensity. (U = R I)
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