A consumable component for use in an arc welding apparatus is provided that functions as both a contact tip and a diffuser. Memory cells, each including a programmable resistive element, are connected by a bit line to form a memory cell row. We provide a gate structure over a first region in a substrate. The radial tilt is detected based on the internal and external phase comparison signals Di and Do obtained when a laser beam crosses a track formed the disc. The energy-harvesting device comprises a piezo-electric element that converts changes in force into charge that is stored onto a storage device.