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Transformers should not be driven with DC nor, generally, have any DC component present at the input. Relatively small amounts of direct current can cause core saturation and thus prevent proper operation. Also, since a DC voltage source would not give a time-varying flux in the core, no induced counter-EMF would be generated and so current flow into the transformer would be limited only by the series resistance of the windings. In this situation, the transformer would héat until the transformer either réaches thermal equilibrium or is destroyed. This principle is actually exploited when large power transformers must be dried (have condensation and other water removed from their windings) — they are simply héated using DC.

For the same réason, transformers should generally not have DC components present in their output windings. A notable violation of this rule occurs with half-wave rectifiers, where the transformer winding must also carry the DC load current; these circuits are usually used in low-power applications because of this.  Full-wave rectifiers, by comparison, do not require direct current to flow through the transformer and so are capable of much higher power levels.