- Distributor fed at one end
- Distributor fed at both ends
- Distributor fed at the centre
- Ring distributor.
The electric power can be transmitted either by means of d.c. or a.c. Each system has its own merits and demerits.
1. D.C. transmission.
For some years past, the transmission of electric power by d.c. has been receiving the active consideration of engineers due to its numerous advantages.