A cell is the basic unit of a an electrochemical battery or a solar module (see solar cell). In the case of a battery, a primary cell consists of two dissimilar elements, known as electrodes, immersed in a liquid or paste known as the electrolyte. A direct current of 1–1.5 volts will be produced by this cell. A secondary cell or accumulator is a similar design but is made useful by passing a direct current of correct strength through it in a certain direction. Each of these cells will produce 2 volts; a 12-volt car battery contains six cells.