consisting of two coils, a transformer coil and a secondary coil with a common connection.
consisting of two coils, a transformer coil and a primary wound on a single iron core.
consisting of one coil that does not pass direct current into the transmitting circuit wound on an iron core.
consisting of two coils a secondary and a primary with a common connection.
The primary difference between a common-battery switchboard and a local-battery switchboard is the:
A switchboard cord contains three conductors and three contacts. These three elements are referred to as:
tip, ring, and sleeve.
positive, negative, and busy.
tip, ring, and ground.
positive, negative, and ring.
In a common-battery system there are two important paths. They are:
direct current path and a talking path.
a talking path and a ringing path.
direct current path and an automatic signaling path.
a talking path and a filter path.