A- basic electricity Flashcards
what is inductance?
Induced voltage, which is opposite in direction to applied voltage
what causes opposition to the flow of applied current in an AC circuit?
Inductive reactants, and capacitance reactants
what represents capacitors in an AC circuit
A capacitor
what is the function of a capacitor?
Serves as a reservoir or storehouse for electricity
why should nickel cadium batteries and lead acid batteries not be stored or serviced in the same area?
they are chemically opposite and the fumes from the lead acid battery can contaminate the electrolytes in the nickel cadium battery
what does an electrical circuit consist of?
A source, resistance and conductor
what is the most important law applicable to the study of electricity?
Ohms law
what are the elements of ohms law?
Voltage,current, and resistance
what units used to measure power in DC circuits
Watt
how much watts equal 1 kilowatts
1,000
what current changes occur in a DC circuit when the applied voltage is increased in the resistance, remains constant
The current increases
what could cause a nickel-cadium battery to fail to deliver its rated capacity?
Cell imbalance, or faulty cells
what are the functions of most multimeters?
They indicate amps, volts and ohms
what is one advantage of AC circuits over DC circuits in aircraft
Saves space and weight
defined the term impedance
The total opposition to the flow of current in an electrical circuit
How many cells make up a lead acid battery rated at 24 Volts
12 cells
What should be the specific gravity of the electrolyte in a fully charged lead acid battery?
Between 1.275 and 1.3
what is the effect of temperature on specific gravity of the electrolyte when checking a lead acid battery?
Temperature changes electrolyte density greater than 90°F or less than 70°F
why is a specific gravity check on the electrolyte in a nickel caladium battery not acceptable to determine battery charge
The electrolyte specific gravity does not change with the state of charge
how is Owens law express in an equation?
E=IxR
What is the most frequent cause of damage to solid state components, and integrated circuits
Electrostatic discharge from the human body due to careless handling
what is magnetism?
The property of an object to attract certain metallic substances
what is the difference between permanent and temporary magnets?
Permanent magnets retain their magnetism, while temporary magnets quickly lose most of their magnetism
What is the definition of a short circuit?
unintentionally, low resistance path between a component/conductor and ground
how would a technician connect a meter in a circuit to read its current
Insert the meter in series
what is the common name for the lines of force that make up a field surrounding a magnet?
Magnetic flux, or flux lines
what is the name of the concept that describes the relationship between electricity and magnetism?
electromagnetism
name at least two sources of electrical energy
thermal, light,pressure, chemical
what is the general purpose of a resistor?
To limit the amount of current flow
how many small fixed resistors value be easily determined
By the color bands
name at least two types of resistors
Fixed and variable
What is the standard unit of measure of frequency?
hertz
describe a basic capacitor
two parallel plates, separated by a dielectric
what is the basic unit of the measure of capacitance?
farad
what is the basic unit of the measure of inductance
Henry
what component can change the electrical energy of a voltage to a different level of energy?
Transformer
when using a multimeter, what setting or type of check is typically used to determine an open in a conductor?
Continuity
when troubleshooting for your open circuit with a multimeter, a closed circuit, or a good wire, will be indicated with what reading
A near zero reading
what instrument is used to measure the density of the electrolyte in a lead acid battery?
Hydrometer
name the two types of batteries commonly used in modern aircraft
Lead acid and nickel cadmium
in regards to batteries, what is an SLA battery?
Sealed lead acid battery
what component can change a DC current into AC current
Inverter
What component can transform, alternating current into direct current?
A rectifier
what is the basic component that allows current to flow in one direction only
diode
what does the acronym LED stand for?
Light emitting diode
describe a basic AND gate
East standard logic symbol that has two inputs or more and one output. The two input signals must be received.
describe a basic OR gate
A standard logic symbol that has two inputs or more and one output.
Only one of the two input signals must be received
