Alternating current system classifications

the various systems may be classified as follows: (1) with respect to the arrangements of the circuit,as (a) series(b) parallel(c) series parallel(d) parallel series. (2) with respect to transformation , as, (a) non transformer;(b) transformer. (3) with respect to the mode of transmitting the energy ,as, (a) constant pressure(b) constant current. (4) with respect to the kind of current ,as (a) single phase(two wire three wire); (b) monocyclic (c) two phases (three wire,four wire, five wire) (d) three phase (three wire ,four wire,six wire,star connection,delta connection,star delta connection,delta star connection); (e) multi phase(of more than three phases) (5) with respect to transmission and distribution , as (a) frequency changing(b) phase changing(c) converter(d) rectifier.