ncat 1-2
in these two types of switches, only lightweight control wires are required to connect the control switch that is, a small current can control large current from a distance
relays and solenoids
a substance's opposition to the flow of electrical current is called
resistance
what scheme is used to cause the circuit breaker closest to the faulty circuit to trip?
selective tripping
a --------- circuit contains only one path for current flow
series
a switch used to close a set of electrical contacts, cause the movement of a mechanical device, or both is called a
solenoid
what does this symbol represent
solenoid
a --------- is a control device with a moveable core that uses electromagnetism to convert electrical energy into mechanical motion
solenoids
an electric force between two bodies that are not touching one another is known as
static electricity
the number of electrons in the outermost shell of an atom determines.
the valence of the atom
if the voltage in a circuit is greater than the voltage rating of a fuse, what can happen after the fuse element melts
the voltage can jump the gap created by the melted fuse element
the magnitude of current flow is primarily dependent on what quality of the mobile electrons
their velocity
a ---------- circuit breaker uses a bimetallic element that is heated by the load current
thermo trip
a ------------ makes use of the fact that in some metals, such as iron, electrons tend to move toward the heated end of a length of metal
thermocouple
which of these is not a manual switch? light switch, ignition switch in a car, thermostat.
thermostat
count the number of different points each pole can connect to in order to determine the number of
throws
the --------- is the part of the circuit breaker that senses the overload condition and causes the circuit breaker to break the circuit
trip element
to check a fuse, remove it from the circuit and test for continuity by
using a ohmmeter
when squeezed, certain ionic quartz crystals, rochelle salts, and tourmaline generate ---------- because charges of opposite polarity appear on opposite sides of the crystal.
voltage
when a conductor in a magnetic field are in motion relative to one another what is generated
voltage or emf
in a parallel circuit, the same ------- is present in each branch of the circuit, but the ----------- in each branch must be calculated independently.
voltage, current
the channel selector on analog aircraft communication radios is typically a multi-layer rotary switch. this type of switch is also known as a
wafer switch
when an electron has been elevated to an energy level higher than its lowest possible energy level, the atom is said to be in an
excited state
when an atom gains or loses electrons as part of an electron exchange with another atom, it is said to be
ionized
in a series circuit, current
is the same through each component of the circuit
------------ is the property of a material that enables it to attract pieces of iron.
magnetism
a chemical combination of two or more atoms is called
molecule
the ---------- fuse is used primarily in low-voltage, low-current circuits with operating ranges usually up to 150 V and from 0.5 to 30
plug-type
a ------- is an electrically operated control switch without a moveable core
relay
the number of -------- indicates the number of different circuits that can be controlled by each pole in a switch.
throws
according to kirchoff's law, the --------- and -----------in a circuit are equal in any given moment.
voltage drops, voltage source
electromotive force (emf) is measured in which of these units
volts
1 kilovolt is equal to
1,000 volts
the voltage in a DC circuit with a 6 A current and 3 resistance is
18 V
the third energy level or shell can contain a maximum of
18 electrons
-------------volts can be written as 30 kV and 0.001 V can be written as--------------
30,0000- 1 microvolt
the power in a DC circuit with 10V and a current of 5A is
50W
a 1/2 horsepower engine that operates 6 hours per day will generate how much power in 30 days
67kWh
a 28 V lamp that requires 2 A needs a switch with a rating of at least
8
the resistance in a DC circuit that generates 2W with 4V applied is
8 resistance
conductance is
Reciprocal of resistance
the equivalent resistance of 10 ohms and 20 ohms resistors connected in parallel is
about 7ohms
push-button, mercury, rocker and toggle are types of circuit
actuator
which of these can occur when a circuit experiences a direct short. 1-excessive current 2-excessive heat 3-full system voltage comes in a contact with the ground
all of these
what consideration is important when selecting a replacement fuse
always use a fuse with the same physical dimensions as the one being replaced
"Bad Boys Run Over Yellow Gardenias Behind Victory Garden Walls" is one way to memorize the order and values of the -------- on a resistors
bands
voltage is produced in a ------------by means of chemical action
battery/primary cell
this switch schematic is
double-pole, double-throw, single-break
switches can be checked with a multimeter, voltmeter, or
ohmmeter
resistance is measured in which of these units
ohms
a device that transform 86 W into useful energy for every 100 W supplied has an ------------of 86 percent
efficiency
which of these is not a state of matter? solid, liquid and emulsion
emulsion
in a series circuit, the sum of the resistor voltage drops must
equal the source voltage
in a series circuit the total resistance is
equal to the sum of the resistances in the circuit
if a resistor suddenly decrease in ohmic value, which of these can occur
excessive current
in a circuit, a difference of potential can exist between two points on the circuit, but usually, the difference in potential is generally measured against the metal chassis on which the parts of the circuit are mounted. this reference is called
ground potential
in a parallel circuit with two branches, each with the same resistance, the current in one branch is
half of the total current
one ----------- is equal to 746 watts
horse power
which statement is true
if the cross-sectional area of a conductor is increase more electrons are available and a higher current can flow under the same applied voltage.
to be effective, circuit protection devices must be connected
in series
what is the term for materials that do not readily conduct electricity.
insulators
the "C" in new commercial-style fuse rating "AG C 3 200V" represents the ---------- and -------- of the fuse
length, diameter
sensitive instruments that can be influenced by magnetism fields are protected by soft iron shields that redirect the ------- around the instrument
lines of force
is anything that occupies space and has weight
matter
an accurate snap-acting switch is also known as a
microswitch
the magnitude of ------------ is measured in amperes, with one ampere equal to one coulomb of charge passing a given point in one second
current
a --------- circuit contains more than one current path connected to the same voltage source.
parallel
---------- describes the ease with which magnetic lines of force distribute themselves through material.
permeability
in a --------- switch, the switch will only remain closed position as long as long as the actuator is held in a certain position
momentary
a car's turning signal and an AM/FM selector on a radio are examples of
multi-contact switches
electric current flows from -------- to -------------
negative, positive
in its natural state, with equal numbers of electrons and protons, an atom's charge is said to be
neutral
the nucleus of an atom contains which two particles.
neutron and proton
a -------- circuit breaker can be bypassed by holding the operating mechanism on
non-trip free
a single-pole, double-throw, two-position switch has no
off position
---------- is a measure of the rate at which work is being done. it is measure in -------------
power, watts
a switches is an example of a circuit control device, while a fuse is an example of a circuit ---------- device
protection
a millivolt equals
0.001 volt
the current in a DC circuit with a 5 V and 5 resistance is
1 A
in atoms with atomic number of 36, if more than --------- electrons spin in the same direction, the atom is magnetized.
18
in Ohm's law, stated in the equation I=E/R, "I" stands for-------"E" stands for ------------- and "R" stands for --------------
current in amps, voltage in volts, resistance in ohms
the ----------- of a fuse is a value expressed in amperes that represents the current the fuse will allow without opening.
current rating
a short circuit is also known as a-------short
direct
the chemical composition of the resistor determines its --------value , while the physical size of the resistor is related to its -----------rating, which is the ability of the resistor to dissipate heat caused by the resistance
ohmic, wattage
coulomb's law states that "charged bodies attract or repel each other with a force that is ----------- proportional to the product of their individual charges, and is ----------- proportional to the square of the distance between them"
directly, inversely
a ---------switch breaks the circuit in two places
double trace
this switch is
double-pole, double-throw
statement about magnetic lines of force are true. 1-magnetic lines of force are continuous and always form closed loops 2-magnetic lines of force always enter or leave magnetic material at right angles to the surface of the material 3-magnetic lines pass through all materials, both magnetic and nonmagnetic.
all of these are true
an -------- switch that is controlled by a mechanical or electrical device rather than by a person
automatic
aviation electronics is also known as
avionics
which of these is not a means by which voltage is produce. Friction, chemical reaction and capacitation.
capacitation
-------- resistors are no longer the most common resistors, as they have a tendency to change value as they age
carbon
a post-type fuse holder is made to hold--------- type fuses
cartridge
which of these is not an automatic switch? thermostat, distributor in a car engine, ceiling fan speed control.
ceiling fan speed control
voltage produced by a battery is the result of
chemical reaction
which of these is not a circuit control device? relay, solenoid, circuit breaker.
circuit braker
a -------- can be reset, making it a more common choice for aviation applications than a fuse, which must be replaced
circuit breaker
to solve DC ---------- circuit problems, simplify the complex circuit into circuits each containing one load.
combination.
silver, coper, gold and aluminum are materials with many free electrons and make good
conductors
what type of fuse is pictured here
copper fuse link
a ------------- is a measure of electrical charge equal to the charge of 6.24x10
coulomb