sistance. The current strength of electricity of a wire
to resist the passage.

Interrupter. A device in a wire or circuit for checking a
current. It also refers to the vibrator of an
induction coil.

Joint. The place where two or more conductors are united.

Joint Resistance. The combined resistance offered by two or more
substances or conductors.

Jump Spark. A spark, disruptive in its character, between two
conducting points.

Initial Charge. The charge required to start a battery.

Kathode, or Cathode. The negative plate or side of a battery. The
plate on which the electro deposit is made.

Key. The arm of a telegraph sounder. A bar with a finger
piece, which is hinged and so arranged that it will
make and break contacts in an electric circuit.

Keyboard. A switch-board; a board on which is mounted a number
of switches.

Kilowatt. A unit, representing 1,000 watts. An electric current
measure, usually expressed thus: K.W.

Kilowatt Hour. The computation of work equal to the exertion of one
kilowatt in one hour.

Knife Switch. A bar of a blade-like form, adapted to move down
between two fingers, and thus establish metallic
connections.

Laminated. Made up of thin plates of the same material, laid
together, but not insulated from each other.

Lamp Arc. A voltaic arc lamp, using carbon electrodes, with
mechanism for feeding the electrodes regularly.

Lamp, Incandescent. A lamp with a filament heated up to a glow by the
action of an electric current. The filament is within
a vacuum in a glass globe.

Leak. Loss of electrical energy through a fault in wiring,
or in using bare wires.

Load. The ampere current delivered by a dynamo under certain
conditions.

Low Frequency. A current in which the vibrations are of
few alternations per second.

Magnet. A metallic substance which has power to attract
iron and steel.

Magnet Bar. A straight piece of metal.

Magnet Coil. A