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