LESSON CONTENT
1.
There are many terms and symbols that are particular to the study of
electricity. As a maintenance supervisor, an understanding of electrical terns
and an ability to interpret schematic wiring diagrams, electrical drawings, and
symbols will enable you to properly supervise maintenance personnel in
diagnosing and locating electrical problems.
a. Electrical Terms.
(1) AC Alternating current, or current that reverses its direction
at regular intervals.
(2) Ammeter An electric meter that measures current.
(3) Battery A device consisting of two or more cells for converting
chemical energy into electrical energy.
(4) Circuit A closed path or combination of paths through which
passage of the medium, electric current, air, and liquid, is possible.
(5) Circuit Breaker In electrical circuits, a mechanism designed to
break or open the circuit when certain conditions exist; especially the device
in automotive circuits that opens the circuit between the generator and battery
to prevent overcharging of the battery. One of the three units comprising a
generator regulator.
(6) Conductor A material through which electricity will flow
readily.
(7) Core An iron mass, generally the central portion of a coil,
electromagnet or armature around which wire is coiled.
(8) DC Direct current or current that flows only in one direction.
(9) Electricity A form of energy that involves the movement of
electrons from one place to another or the gathering of electrons in one area.
(10) Electromagnet A temporary magnet constructed by winding a
number of turns of insulated wire into a coil or around an iron core.
(11) Electron A negative particle that is a basic constituent of
matter and electricity.
(12) Flux Lines of magnetic force moving through a magnetic field.
(13) Ground Connection of an electrical unit to the engine/frame to
return the current to its source.
Previous Page
