Appendix I Glossary -141200433

APPENDIX I

GLOSSARY

AVERAGE VALUE OF AC-- The average of all

ACID-- A solution that contains an excess of hydrogen

ions and exhibits a pH below the neutral value of 7.

the instantaneous values of one-half cycle of

alternating current.

ACTIVE-- A state in which a metal tends to corrode

(opposite to passive); freely corroding.

BASE-- A solution that contains an excess of hydroxyl

ions and exhibits a pH above the neutral value of 7.

AIR-CORE TRANSFORMER-- A transformer

composed of two or more coils, which are wound

BATTERY-- A device for converting chemical energy

around a nonmetallic core.

into electrical energy.

ALARM LOG-- A record of quantities that are in an

BATTERY CAPACITY-- The amount of energy

alarm condition only.

available from a battery. Battery capacity is

expressed in ampere-hours.

ALARM ACKNOWLEDGE-- A push button that

must be depressed to silence an alarm horn.

BELL LOG-- A printed record of changes in the ship's

operative conditions, such as speed or point of

AMMETER-- An instrument for measuring the

amount of electron flow in amperes.

control.

AMPERE-- The basic unit of electrical current.

BINARY UNIT-- One of the two possible alternatives,

such as 1 or 0, YES or NO, ON or OFF.

ANALOG DATA-- Data represented in continuous

form, as contrasted with digital data having discrete

BLOCK DIAGRAM-- A drawing of a system using

values.

blocks for components to show the relationship of

components.

ANNUNCIATOR-- A device that gives an audible and

a visual indication of an alarm condition.

BURNISHING TOOL-- A tool used to clean and

polish contacts on a relay.

ANODE-- The positive electrode of an electro-

chemical device toward which the negative ions are

CARD-- See PRINTED CIRCUIT BOARD.

drawn.

CASUALTY-- An event or series of events in progress

A N T I F O U L I N G -- The prevention of marine

during which equipment damage and/or personnel

organism attachment or growth on a submerged

injury has already occurred. The nature and speed

metal surface through chemical toxicity. Achieved

of these events are such that proper and correct

by the chemical composition of the metal, including

procedural steps will only serve to limit equipment

toxins in the coating, or by some other means of

damage and/or personnel injury.

distributing the toxin at the areas to be kept free of

CATHODE-- The general name for any negative

fouling.

electrode.

APPARENT POWER-- That power apparently

CATHODIC CORROSION-- Corrosion of a metal

available for use in an ac circuit containing a

reactive element. It is the product of effective

when it is a cathode. Occurs on metals, such as A1,

voltage times effective current expressed in

Zn, Pb, when the water solution turns strongly

voltamperes. It must be multiplied by the power

alkaline as a result of the normal cathodic reactions.

factor to obtain the true power available.

It is a secondary reaction between the alkali

generated and the amphoteric metal.

AQUEOUS-- A term pertaining to water; an aqueous

solution is a water solution.

CATHODIC POLARIZATION-- The change of the

electrode potential in the negative direction due to

ARMATURE-- In a relay, the movable portion of the

relay.

current flow.

AI-1