AC fundamentals test 4 - final

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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


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