Here the correct answer is , that is, much greater than the speed of travel of a voltage pulse along a metallic wire.An electrical signal flows through a conductive substance, like copper or aluminium, when it is transferred through a metallic wire. Electrical current is what is being described here. The physical parameters of the wire, such as its diameter and material, as well as the properties of the medium through which the current is moving, affect how quickly an electrical current flows.