chapter 3 section A-C
What formula may be used to find the total resistance in a parallel circuit if all of the resistances are the same?
Rt = R/N
The constant _____ charging method is the most effective method for charging aircraft batteries.
current
Materials which oppose the movement of electrons are called
insulators
The device used to change DC to AC is the ______
inverter
A charged atom is known as an
ion
How much power is needed to life a 12,000-pound aircraft three feet in one minute?
1.09 horsepower 813.8 watts
The specific gravity of a fully charged lead-acid battery is approximately _______
1.275
The speed of electron movement is considered to be ____ miles per second. This is the same speed of _____
186,000 , light
The open circuit voltage of a lead-acid battery is approximately ______ volts
2.1
A DPDT switch will control _____ circuits, and it has either _____ or _____ positions
83, 101, less
Each unit of electrical measurement may be expressed using a single letter. What letters are used for the expressions below?
Voltage: E Current: I Resistance: R Power: P
Name 5 ways electrical energy may be generated
a. Magnetism b. Chemical c. Thermal d. Pressure e. Light
The ampere-hour capacity of a lead-acid battery is determined by:
a. amount of active material b. area of the plates c. amount of electrolyte d. temperature
The resistance of a conductor is affected by what three factors?
a. physical characteristics b. dimensions c. temperature
Name the three components needed to complete an electrical circuit
a. source b. load c. conductors
Aircraft circuit breakers may operate on what two principles?
a. thermal b. magnetic
Static dischargers on an aircraft control surface provide sharp points from which a static charge can be dissipated from the control surface into the _____
air
When one coulomb of electrons flows past a point in one second, there is a current flow of one ____
ampere
Spilled electrolyte from a lead-acid battery may be neutralized using a solution of ______ ____ and water_.
baking soda
If water is added to any cell of a nickel cadmium battery, the amount and location of the cell should be recorded in the _____ ____ ____
battery service record
Flexible metal braids called _____ straps connect the control surfaces to the aircraft structure to prevent the buildup of static charges
bonding
The negative plates of a nickel-cadmium cell are impregnated with ______ hydroxide
cadmium
A primary cell ____ be recharged.
cannot
A battery is a device which changes _____ energy to ________ energy
chemical, electrical
Using a soft iron core in an electromagnet increases its strength because it _____ the lines of flux
concentrates
Materials which permit the flow of electrons are referred to as
conductors
The ______ is the basic unit of electrical quantity and is equal to 6.28 billion, billion electrons.
coulomb
In a series circuit, the _____ is the same throughout the circuit.
current
The capacity of a battery is its ability to produce a given amount of _____ for a specified time
current
If the capacity of a nickel-cadmium battery is less than it should be, or if there is an indication that some of the cells are unbalanced, the battery should be ____ ____
deep cycled
The specific gravity of the electrolyte in a nickel-cadmium battery ______ change as the state of charge of the battery changes.
does not
There are two types of electromagnets used in practical applications, those having _____ cores and those having _____ cores
fixed, movable
One _____ represents a magnetic flex density of one maxwell per square centimeter.
gauss
The electrolyte level of a nickel-cadmium battery is ______ immediately after the battery charge is complete
highest
A material is said to have a positive temperature coefficient of resistance if its resistance _______ as its temperature increases
increases
_____ ________ is the magnetism remaining in a material after the magnetizing force has been removed
residual magnetism
The active material on the positive plate of a fully charged lead-acid battery is _____ ____
lead peroxide
When a lead-acid battery is discharged, the active material on both positive and negative plates is converted to ______ _____
lead sulfate
The most commonly used storage battery in light aircrraft is the _____ battery.
lead-acid
The five-minute discharge rate of a lead-acid battery gives _____ ampere-hours than the five-hour rate?
less
The total resistance of a parallel circuit is ______ than the resistance of any of the paths
less
When electrons flow in a conductor, they cause an ______ to surround the conductor
magnetic field
During the service of a nickel-cadmium battery, the electrical leakage between the cells and the case should be checked using a _______
milliammeter
A body having an accumulation of electrons on its surface is said to have a ______ static charge.
negative
An atom having more electrons than protons will carry a ______ charge
negative
When removing a battery from an aircraft, you should remove the _____ lead first
negative
Electron flow is considered to be from the _______ terminal of the battery, through the circuit, and return to the _____ terminal of the battery.
negative, positive
The positive plates of a nickel-cadmium cell are impregnated with _______ hydroxide.
nickel
The lines of magnetic flux are considered to leave the _____ pole of a magnet and enter at the _____ pole
north, south
The strength of an electromagnet is determined by the _____ and by the _____ flowing through it
number of turns, amount of current
The _____ is the standard unit of electrical resistance, or opposition of current flow
ohm
If there is an interruption, or break, in an electrical circuit, is is said to be ______
open
The ______ is capable of changing DC to AC using electronics
oscillator
The most widely used circuit arrangement is the _______ circuit
parallel
The ease with which lines of magnetic flex can pass through a material is known as a material's ________
permeability
An atom having fewer electrons than protons will carry a ______ charge
positive
When installing a battery in an aircraft, you should correct the _____ lead first.
positive
The white powder that forms on the top of a nickel-cadmium battery that has been in service is _____ _____ _____
potassium carbonate
The electrolyte level of a nickel-cadmium battery is _______ ______ and water
potassium hydroxide
A ________ may be used as a voltage divider.
potentiometer
A variable resistor having three terminals is called a ________
potentiometer
_________ is the opposition to the flow of magnetic force.
reluctance
________ is the ability of a material to retain magnetism after a magnetizing force is removed.
retentivity
A variable resistor having two terminals is called a _____
rheostat
If there is only one path for electrons to flow, the circuit is called a ____ circuit
series
If there is a path from one terminal of one the source to the other, without passing through the load, the circuit is said to be ______
shorted
A glass tubular fuse that uses a small spring to pull the fusible link apart is called ____ fuse
slow blow
An electromagnetic switch having a movable core is called a
solenoid
the sum of all of the voltage drops in a series circuit is equal to the _______
source voltage
The active material on the negative plate of a fully charged lead-acid battery is ______ _____
spongy lead
The electrolyte of a lead-acid battery is made up of _____ ____ and water
sulfuric acid
The total power dissipated in a parallel circuit is equal to the _____ of the power dissipated in each of the individual load resistances
sum
the total resistance in a series circuit is the _______ of the individual load resistances
sum
Nickel-cadmium battery installations are required to have _____ monitoring equipment.
temperture
One ______ is equal to a magnetic flux density of one weber per m²
tesla
The _________ dissipated in a series circuit is equal to the sum of the power dissipated in each of the individual load resistances
total power
______ circuit breakers will open the circuit irrespective of the position of the operating control.
trip-free
High charging currents in the nickel-cadmium batteries may cause a breakdown of the cellophane-like cell separator material, resulting in a condition known as _______ or _____
vicious cycling, thermal runaway
The unit of electrical pressure is known as the ______
volt
A nickel-cadmium battery can maintain a nearly constant ______ until it is almost totally discharged.
voltage
The ______ remains the same across any of the paths of a parallel circuit
voltage
The generating system in an aircraft utilizes the constant ______ method to charge a battery
voltage
Electrical power is expressed in _______
watts