Electrochemical methods are analytical techniques that use measurements of potential, charge, or current to determine an analyte's concentration or characterize its reactivity. The key electrochemical methods are potentiometry, voltammetry, coulometry, conductometry, and dielectrometry. These methods use electrochemical cells containing electrodes to control and measure current and potential under static or dynamic conditions according to Ohm's law. Common techniques include potentiometry (potential measurements), voltammetry (current measurements under varying potential), and coulometry (current or potential measurements to completely convert an analyte).