What are vampire electronics?

Question

What are vampire electronics?

Answer 1

Do you mean something like Vampire clamps?  If so, they are clamps that have rigid teeth that pierce the plastic sheilding on wires to get into the metal or whatever on the inside.  They look like, and are sometimes called, alligator clamps since they somewhat resemble a metal alligator's mouth

Answer 2

"Vampire electronics" are electronics that keep draining power even though they're turned off.

Answer 3

They are electronics that use power even if the power switch is off.  Some good examples are the electronics that monitor the power switch and wall transformers.