AC fundamentals test 4 - final
an electrical device that allows current to move through it in one direction with far greater ease than in the other direction.
diode
The _________________ transformer changes the high voltage of power company distribution lines to the common 240/120-V used to supply power to most homes and many businesses.
distributions
When the polarity of the incoming power is in a direction that allows current flow through the diode it is known as ____________________
forward biased
the number of cycles per second.
frequency
is the measure of the cycles per second, frequency.
hertz
________is the total opposition to alternating current in an AC circuit containing any combination of Resistance, Induction, or Capacitance.
impedance
___________ is the measure of the opposition to current flow that is created by inductance.
inductive reactance
Apparent Power is measured in
kVA
Reactive Power is measured in
kVAR
True Power is measured in
kW
When you have capacitors in an AC circuit, the current will _____________ the voltage.
lead
Loads that are intended to operate on 120 V connect from the center tap or ____ to one of the secondary lines.
neutral
Capacitance is created when two conductors are separated by a _____________ material, or Dielectric.
non-conductive
maximum amplitude of the sine wave.
peak
the distance between positive peak and the negative peak.
peak to peak
is the time taken to complete one cycle.
period
___________ for an AC circuit is the ratio of true power to the apparent power in that circuit.
power factor
The _______ winding of a transformer is the power input winding.
primary
_________ is the type of power that is found in a purely inductive circuit or a purely capacitive circuit.
reactive power
When the polarity of the incoming power is in a direction that does not allow current flow through the diode it is known as ____________________
reverse biased
Explain the difference between a step up and a step down transformer.
step-up will increase voltage and decrease current step down will decrease voltage and increase current
a magnetically operated machine that converts electrical power from one circuit to another without changing its frequency.
transformer
______________ is the power actually used to do work.
true power
What are the three types of Power in an AC circuit
true power apparent power reactive power
A basic law concerning transformers is that all values of a transformer are proportional to its ____ ratio.
turns
A basic law concerning transformers is that all values of a transformer are proportional to its _______ ratio.
turns
___________ the power used to do work plus the power stored during part of a cycle by inductance and capacitance and then returned to the power source.
Apparent power
What are the three forms of Ohm's Law when we have Impedance?
E=I*Z I=E/Z Z=E/I
is considered the effective Voltage or Current
RMS
is the definition of half of one cycle.
alternation
____________ is the opposition to the flow of current due to capacitance.
capacitive reactance
Capacitance is the ability to store electric ____________.
charge
Inductance is the property of an electrical conductor by which a change in electric _______________ through it induces a voltage in the conductor.
current