Electricity For HVAC, Chapters 7-9
Terms Questions And Answers With
Verified Solutions Already Passed!!!
Alternator - ANSWER✔✔a generator that produces an alternating current
Peak voltage - ANSWER✔✔when the voltage reaches its peak in an alternating
current circuit. AC reaches a peak at 90 electrical degrees
Capacitive reactance - ANSWER✔✔The opposition that a capacitor offers to the
applied AC voltage. Causes the amperage to lead the voltage
Phase - ANSWER✔✔the number of currents alternating at different times in an
alternating current circuit
Delta system - ANSWER✔✔A three-phase electrical supply system that is
determined by transformer hook up. The Delta system, due to the Transformer
hookup, gives two usable low voltage legs plus a high leg. The Delta system is
used when a large number of 3-phase loads are used.
Power factor - ANSWER✔✔The ratio of true power to apparent power, usually
expressed as a percentage
Effective voltage - ANSWER✔✔In A-C this is 0.707 times the peak (Maximum)
voltage.
Reactance - ANSWER✔✔The resistance that alternating current and counters
when it changes in flow
Frequency - ANSWER✔✔The number of complete cycles per second of
alternating current
Sine wave - ANSWER✔✔A graphical representation of alternating current; a
graph showing the sine function of all angles from 0 to 360 degrees
Impedance - ANSWER✔✔The sum of the resistance and reactance in an
alternating current circuit.
, Single phase - ANSWER✔✔An electrical power supply that supplies two hot legs
of electrical energy to a circuit
Inductance - ANSWER✔✔A property of an alternating current circuit by which an
electromotive force is produced in it by a variance in current.
Three phase - ANSWER✔✔An electrical power supply that supplies three hot legs
of electrical energy to a circuit.
Inductive reactance - ANSWER✔✔The opposition to the change in alternating
current flow that produces an out of phase condition between voltage and
amperage
Wye system - ANSWER✔✔A three-phase electrical supply system that is
determined by transformer hookup. The wye
system due to the transformer hookup gives three
usable low-voltage legs. The wye system is used when a large number of low-
voltage, single-phase circuits are needed.
Capacitor - ANSWER✔✔A device that consists of two aluminum plates with an
insulator between the plates; used to boost the starting torque of single-phase
motors. The two types of capacitors are electrolytic or starting, and running or oil
filled.
Microfarad - ANSWER✔✔The unit of measurement used to measure the strength
of a capacitor.
Capacitor-start motor - ANSWER✔✔A motor that uses a starting capacitor to
increase the starting torque
Permanent magnet - ANSWER✔✔A piece of material that is magnetic by physical
means. Iron, nickel, cobalt, and chromium are materials that can easily be
magnetized and will maintain their magnetism for a period of time
Capacitor-start-capacitor-run motor - ANSWER✔✔A high starting torque and
good running efficiency motor; it uses a starting capacitor to increase starting
torque and a running capacitor to increase running efficiency
Terms Questions And Answers With
Verified Solutions Already Passed!!!
Alternator - ANSWER✔✔a generator that produces an alternating current
Peak voltage - ANSWER✔✔when the voltage reaches its peak in an alternating
current circuit. AC reaches a peak at 90 electrical degrees
Capacitive reactance - ANSWER✔✔The opposition that a capacitor offers to the
applied AC voltage. Causes the amperage to lead the voltage
Phase - ANSWER✔✔the number of currents alternating at different times in an
alternating current circuit
Delta system - ANSWER✔✔A three-phase electrical supply system that is
determined by transformer hook up. The Delta system, due to the Transformer
hookup, gives two usable low voltage legs plus a high leg. The Delta system is
used when a large number of 3-phase loads are used.
Power factor - ANSWER✔✔The ratio of true power to apparent power, usually
expressed as a percentage
Effective voltage - ANSWER✔✔In A-C this is 0.707 times the peak (Maximum)
voltage.
Reactance - ANSWER✔✔The resistance that alternating current and counters
when it changes in flow
Frequency - ANSWER✔✔The number of complete cycles per second of
alternating current
Sine wave - ANSWER✔✔A graphical representation of alternating current; a
graph showing the sine function of all angles from 0 to 360 degrees
Impedance - ANSWER✔✔The sum of the resistance and reactance in an
alternating current circuit.
, Single phase - ANSWER✔✔An electrical power supply that supplies two hot legs
of electrical energy to a circuit
Inductance - ANSWER✔✔A property of an alternating current circuit by which an
electromotive force is produced in it by a variance in current.
Three phase - ANSWER✔✔An electrical power supply that supplies three hot legs
of electrical energy to a circuit.
Inductive reactance - ANSWER✔✔The opposition to the change in alternating
current flow that produces an out of phase condition between voltage and
amperage
Wye system - ANSWER✔✔A three-phase electrical supply system that is
determined by transformer hookup. The wye
system due to the transformer hookup gives three
usable low-voltage legs. The wye system is used when a large number of low-
voltage, single-phase circuits are needed.
Capacitor - ANSWER✔✔A device that consists of two aluminum plates with an
insulator between the plates; used to boost the starting torque of single-phase
motors. The two types of capacitors are electrolytic or starting, and running or oil
filled.
Microfarad - ANSWER✔✔The unit of measurement used to measure the strength
of a capacitor.
Capacitor-start motor - ANSWER✔✔A motor that uses a starting capacitor to
increase the starting torque
Permanent magnet - ANSWER✔✔A piece of material that is magnetic by physical
means. Iron, nickel, cobalt, and chromium are materials that can easily be
magnetized and will maintain their magnetism for a period of time
Capacitor-start-capacitor-run motor - ANSWER✔✔A high starting torque and
good running efficiency motor; it uses a starting capacitor to increase starting
torque and a running capacitor to increase running efficiency
