colored for polarity - red(positive) - Black(negative)

1-7 Flashcards by Daniel Kaizer

Electricity

Physical phenomena arising from existence and interaction of an electrical charge.

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Voltage/electromagnetic force

amount of force being applied to a circuit to produce an electron flow

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Amperage

quanitity of electricity flowing through the circuit

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Resistance

opposition to the flow of electrons offered by a device or material

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OHM(Omega)

Measurement of resistance to current flow

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Watt

Measurement of electrical work done.

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Static form of electricity

Electricity at rest(Hard to measure)

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Positive/Positive

Repel each other

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positive/negative

Attract together

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Static Electricity is produced by

Friction

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Dynamic Electricity

Used in every day life(easy ot measure)

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MECHANICAL method of producing electricity:

Produced by rotating a magnetic field through another magnetic field

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CHEMICAL method of producing electricity:

Produced by surrounding two or more metallic plates with chemical electrolyte.(BATTERY!)

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THERMAL method of producing electricity:

Produced by joining two dissimilar metals and applying heat

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PRESSURE method of producing electricity:

Produced by applying pressure to quartz, which will produce an electron flow.

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Direct Current

Steady current flow in one direction

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Alternating Current

Current flow that reverses direction at specific intervals(HERTZ/CYCLES)

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Electrical test equipment safety

-Determine power requirements before testing
-Remove jewelry
-Inspect test equipment for calibration date, broken or frayed wires, etc.
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Multimeter Purpose

To measure voltage, current and resistance

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Test Leads are

colored for polarity

red(positive)
Black(negative)

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Multimeter digital display features POWER_UP

all segments appear while instrument performs a self test. will chirp when ready

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Multimeter digital display features OVERLOAD INDICATION

indicates input is too large to display.

multimeter digital display features LOW BATTERY

appears when 100 hours remain. will go standby when 1 hour remains

Aircraft electrical system purpose

Produce and provide electrical power to the various aircraft systems

Aviation electrical system components GENERATOR

Produces AC electrical power of three-phase. Driven by constant speed drive

Aviation electrical system components CONTROL SWITCHES

located in flight station/cockpit. used to select electrical power

Aviation electrical system components GENERATOR ADVISORY LIGHTS

indicated if generator is supplying power

Aviation electrical system components TRANSFORMER RECTIFIERS

converts AC power to DC power.

Aviation electrical system components POWER DISTRIBUTION(AC/DC) BUSES

a bus is a power distribution point to which a number of circuits may be connected. Protected by circuit breakers

Aviation electrical system components EMERGENCY GENERATOR

Provice electrical power to both AC and DC buses in event of main generator failure. Powered by RAM air turbine

Aviation electrical system components EXTERNAL ELECTRICAL POWER RECEPTACLE

provides a means of connecting an electrical source of external electrical power for ground maintenance and servicing.

Purpose of Symbols

To represent components on a diagram

Types of Symbols POLARITY

Represent positive and negative

Types of Symbols GROUND

Indicated a units casing is grounded to earth

Types of Symbols CONNECTION

Indicates wires are connected with a DOT representing connection

Types of Symbols NO CONNECTION

indicates wires are not connected

Types of Symbols DISCONNECT

indicates that aline may be disconnected

Types of Symbols CONNECTOR(CANNON PLUG)

Represent a number of lines together that may be plugged/unplugged

Types of Symbols BATTERY

represents a DC power Source | ---| | | | |---

Types of Symbols FUSE

represents an electrical safety device

Types of Symbols PUSH PULL CIRCUIT BREAKER

represents a reusable electrical safety device

Types of Symbols LAMP

represents light emitted by the flowing of a heater material. know as a filament

Types of Symbols SWITCH

represents a device used to connect, disconnect, or redirect power

Types of switches

single pole - single throw single pole - double throw double pole - double throw

Types of Symbols VOLTMETER

measure voltage V

Types of Symbols AMMETER

measures amperage A

Pictorial diagram

provides a means of readily identifying the components of a system( simplest of all diagrams

Block Diagram

presents a general description of a system and its function. arranged with labeled blocks

Schematic diagram

``` Illustrates various componets that make up a system. uses symbols. in order. contains a legend Most useful for learning aid ```

Series Circuit

circuit with only one path of current flow

Parallel circuit

circuit with two or more paths for current flow

series parralel circuit

circuit which is part SERIES and part PARALLEL

During servicing and maintenance, always ensure that

air craft is properly grounded to guard against static electricity

prior to applying external power to an air craft, ensure

all switches are in safe, off, or normal position