Elec Final Flashcards
what happens to current in a circuit where resistance is increased
Decreases
what will happen to current when voltage is increased
Increases
what is Ohms law
V=IxR
what remains constant in a parallel circuit
Voltage
What remains the same in a series circuit
Current
What is the formula to determine Wattage
P=IxV
what is the minimum amount of current required to activate a relay
pick up current
what happens to a normally closed contact when it is unpowered
It remains closed / active
what does DPST-NO stand for
Double pole, single throw, normally open
A diode with low resistance in both directions is most likely
Shorted
what are aircraft circuit breakers designed to protect
wires
the cathode of a diode represents which side
negative
what is the bias voltage on a silicone semiconductor
0.7 Volts
what are the 3 connections on a transistor
base, collector, emitter
what is the main difference between a fuse and a circuit breaker
circuit breaker can be reset
what are the two different battery cell types? which can be recharged
primary and secondary
secondary can be recharged
how would the voltage of two or more batteries be increased
hook them in series
what is the name of the negative pole on a battery
cathode
will the closed circuit voltage of a battery always be higher than the open circuit voltage
no
what effect would hooking two or more batteries in parallel have
increase the current output
when a transistor is on, what will the voltage between the base and emitter be
0.7V
what are two types of transistors
NPN and PNP
what happens to the electrolite of a NI Cad battery when charging
Increases
what are the two most common aircraft batteries? which is more commonly used in larger aircrafts
lead acid and Nickle Cadmium (Ni Cad)
Ni Cad is most common in large aircrafts
what is used as electrolite in lead acid batteries
sulfuric acid and water
what is the single cell voltage of a lead acid battery
2.1V
what is used to test the armature of a generator
Growler
what affects the output of DC generators
Speed of rotation
what functions are normally incorporated into a three unit voltage regulator
Voltage, current limiter, reverse current relay
what produces the magnetic field in a generator
field windings
what is commonly used to reduce static build up on aircrafts
static wicks
what direction must a conductor move through a flux field to produce EMF
Perpendicular (90 degrees)
what is the procedure called for restoring magnetism in a field pole
flashing
what was introduced by michael faraday
flux lines
do unlike poles attract
yes
what happens when current through a coil is increased
magnetism increases
what happens to the output voltage if the shunt field current decreases
decreases
do generators have slip rings
no
what term describes the production of a magnetic field around the armature
armature reaction
what are the three most common types of generators and motors
shunt, parallel and compound
when connecting a battery, which lead should be connected first
positive
