AC Fundamentals test 3

___________ expresses the relationship by the fractional amount of total flux linking the primary and secondary coils

Coefficient of Coupling

Explain the difference between a step up and a step down transformer.

Step up takes voltage up and step down takes voltage down Step up - current lowers step down - current goes up

a magnetically operated machine that converts electrical power from one circuit to another without changing its frequency.

Transformer

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

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.

distribution

Apparent Power is measured in _________.

kVA

Reactive Power is measured in _________.

kVAR

True Power is measured in ____________.

kW

The ability of one coil to induce a voltage into another coil is called ________ induction.

mutual

Loads that are intended to operate on 120 V connect from the center tap or ________ to one of the secondary lines.

neutral

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

the type of power that is found in a purely inductive circuit or a purely capacitive circuit.

reactive power

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