biological species concept. Members of the same species are capable of interbreeding, producing viable offspring, and cannot produce viable offspring with members of other species. This is one of several concepts that define a species, and is the most commonly used and accepted of those concepts.he most common method for species differentiation is the biological species concept, which defines a species as a population of organisms that can interbreed to produce viable, fertile offspring.
Electric current definition. Electrical current is the flow rate of electric charge in electric field, usually in electrical circuit. Using water pipe analogy, we can visualize the electrical current as water current that flows in a pipe. The electrical current is measured in ampere (amp) unit.
Also see voltage, resistance, and Ohm's Law. Current is a flow of electrical charge carriers, usually electrons or electron-deficient atoms. The common symbol for current is the uppercase letter I. The standard unit is the ampere, symbolized by A. One ampere of current represents one coulomb of electrical charge (6.24 x 1018 charge carriers) moving past a specific point in one second.