There is a tag named combinationalcircuits which has 12 tagged questions that seem to range from mostly combinational logic circuit type questions to one about power electronics. There was also another question just asked about resistors in parallel that used the tag (I've retagged that one).
It seems to be a rather useless tag and should probably be deleted (IMO). Doing so wouldn't leave any existing questions untagged nor make them harder to find.
If not deletion, perhaps renaming it to combinational-logic or something similar would make sense (and then remove the tag from a couple of existing questions). But I don't see much point in that given how few questions there are using the tag.