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NCATT AET Study Guid

Alternating Current Basic Terms

QuestionAnswer
The flow of electrons that continuously changes its value in magnitude and reverses direction Alternating Current
The time required for one cycle of AC to occur is called a Period
Easier to produce in mass quantities Alternating Current
The product of effective voltage and effective current which is expressed in volt amps rather than Watts Apparent power
Opposition to current flow in a circuit Capacitive Reactance
The affect that capacitance has on an ac circuit Capacitive Reactance
In an ______ capacitance causes current to lead voltage in phase Alternating Current
Capacitance values are given in Ohms
Windings arranged in the shape of a triangle Delta Wound
Amount of ac that produces the same amount of heat as a corresponding value of DC Effective Voltage
The effective voltage of a AC is referred to as Root Mean Square Value
What value is always less than peak value of AC Effective Value
All values of AC are considered Effective Values
Number of cycles of ac completed in one second Frequency
Frequency is expressed in. Hertz
The frequency of most ac used in aircraft 400 Hz
electrical characteristic of a conductor Impedance
Impedance is represented by the letter Z
The total opposition to the flow of AC in an electrical circuit Impedance
Impedance values are given in Ohms
Opposition to current flow in a circuit Inductive Reactance
The affect that inductance has on an Ac circuit is Inductive Reactance
What causes current to lag voltage in phase Inductance
Inductance is represented by the letters XL
Inductance values are given in Ohm
Angle between two similarly varying quantities Phase angle
Production of two or more phases of AC or two or more alternating voltages of the same frequency Poly Phase
How many phases do poly phases use Three Phases
The Ratio of the actual power dissipated in an electrical system to the input of power of volts multiplied by amps Power Factor
The ratio of power dissipated of input Power Factor
What electronic device that converts AC to DC Rectifier
The effective values of sine-wave alternating current Root Mean Square
What is the peak value of the RMS .707
Alternating current wave form produced by rotary generator Sine-Wave
What are values of voltage and current that start at zero and smoothly rise to a peak value the smoothly falls to zero Sine-Wave
One AC cycle is produced by one 360 degree rotation
The power actually available in an AC current True Power
The product of the circuit voltage and the current in phase with this voltage True Power
True power values are given in Watts
What are windings arrange din the shape of a Y Wye Wound
Created by: Seven1911
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