Appendix I Glossary - Cont'd -141200442

VOLTAGE DROP-- The difference in voltage

TRIP-FREE CIRCUIT BREAKER-- A circuit

breaker that will open a circuit even if the operating

between two points. It is the result of the loss of

mechanism is held in the ON position.

electrical pressure as a current flows through a

TRUE POWER-- The power dissipated in the

resistance.

resistance of the circuit, or the power actually used

WATCH STATION-- Duties, assignments or

in the circuit.

responsibilities that an individual or group of

TURN-- One complete loop of a conductor about a

individuals may be called upon to carry out; not

core.

necessarily a normally manned position with a

TURNING GEAR-- See JACKING GEAR.

"watch bill" assignment.

TURNS RATIO-- The ratio of the number of turns in

WATT-- The practical unit of electrical power. It is the

the primary winding to the number of turns in the

amount of power used when 1 ampere of dc flows

secondary winding of a transformer.

through a resistance of 1 ohm.

VOLT-- The unit of electromotive force or electrical

WATT-HOUR-- A practical unit of electrical energy

pressure. One volt is the pressure required to send

equal to 1 watt of power for 1 hour.

1 ampere of current through a resistance of 1 ohm.

VOLTAGE-- (1) The term used to signify electrical

WATTAGE RATING-- A rating expressing the

pressure. Voltage is a force that causes current to

maximum power that a device can safely handle.

flow through an electrical conductor. (2) The

WEBER'S THEORY-- A theory of magnetism that

voltage of a circuit is the greatest effective

assumes that all magnetic material is composed of

difference of potential between any two conductors

many tiny magnets. A piece of magnetic material

of the circuit.

that is magnetized has all of the tiny magnets

VOLTAGE DIVIDER-- A series circuit in which

aligned so that the north pole of each magnet points

desired portions of the source voltage may be

in one direction.

tapped off for use in equipment.