Systems of the electrical units and the fundamental constants

Various modifications of an electrical part of the SI (Le Systeme International d´Unite´s) are considered. The systems are generated by fixed values of the electrical fundamental constants. Constants whose values were adopted since 1990 for current representation of the electrical units of the SI via the Josephson and the quantum Hall effects are considered as the constants of the systems. The relations between the systems and ratios of sizes of the units are also considered. Consequences for calculation of the units sizes in process of treatment of data on the fundamental constants are discussed.