(DC) corresponds in German to a direct voltage and not, as would be correct, to a direct current. Direct current is characterized by the fact that the current always flows in the same direction. The
current intensity may change, but the direction is always the same.Direct current or DC voltage is used as a supply voltage for electronic components and devices. This can be the DC voltages obtained from the mains voltage (AC) via rectifiers or DC voltages from batteries or accumulators. Direct current always has a fixed reference polarity, which can be positive or negative. The designation itself says nothing about the polarity or the voltage level.