An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte, a vacuum or air). Electrodes are essential parts of batteries that can consist of a variety of materials depending on the type of battery. The electrophore, invented by Johan Wilcke, was an early version of an electrode used to study static electricity. Anode and cathode in electrochemical cells
Electrodes are an essential part of any battery. The first electrochemical battery made was devised by Alessandro Volta and was aptly named the Voltaic cell. This battery consisted of a stack of copper and zinc electrodes separated by brine-soaked paper disks. Due to fluctuation in the voltage provided by the voltaic cell it wasnt very practical. The first practical battery was invented in 1839 and named the Daniell cell after John Frederic Daniell. Still making use of the zinc–copper electrode combination. Since then many more batteries have been developed using various materials (see List of batteries). The basis of all these is still making use of two electrodes which can be divided in two categories: Anodes and Cathodes. Anode
A term coined by William Whewell at Faradays request, derived from the Greek words ἄνο (ano), upwards and ὁδός (hodós), a way. The Anode is the electrode through which the conventional current enters from the electrical circuit of an electrochemical cell (battery) into the non-metallic cell. The electrons then flow to the other side of the battery.
Linear verrucous epidermal nevus  is a skin lesion characterized by a verrucous skin-colored, dirty-gray or brown papule. : 771 : 633   Generally, multiple papules present simultaneously, and coalesce to form a serpiginous plaque. : 633   When this nevus covers a diffuse or extensive portion of the bodys surface area, it may be referred to as a systematized epidermal nevus, when it involved only one-half of the body it is called a nevus unius lateris. : 771

See also
Inflammatory linear verrucous epidermal nevus
Epidermis
Skin lesion
List of cutaneous conditions

References


== External links ==