BIO304H5 Study Guide - Midterm Guide: Cathode Ray Tube, Nernst Equation, Electrochemical Potential
Document Summary
Water conducts electric current, which is why we are frequently cautioned against using electrical appliances in wet conditions. Electrons, which carry electric current in metals and semiconductors, play no direct role in the flow of electric current in aq soln. Two electrodes immersed in a kcl soln and connected by wires to a voltage source (fig. By convention, the current in soln is considered to flow in the direction of cation migration (cathode) An electric current always meet some electrical resistance to its flow. A difference in potential or voltage exists between separated positive and negative charges: this potential difference is related to the current, i and resistance, r as described by ohm"s law. Three major factors determine the resistance to current flow in a soln: the availability of charge carriers in the soln (ie. the ion concentration) The more dilute the electrolyte soln, the higher the resistance, the lower its conductivity.
