NATE: Alternating Current
How many degrees are any two hot legs of a three-phase electrical system out of phase with each other
120 degrees
When placing a voltmeter across two hot legs of 240 volt three-phase power supply, what voltage should be present
240 volts
If the current of an AC circuit changes direction 100 times in one second, the frequency of the power is
50 Hz
One complete sine wave represents
A complete cycle of a generator
The purpose of connecting a ground wire to a load is to
Allow a secondary path for electrons during a grounded condition
How does alternating current get its name
Alternating current constantly changes direction in a circuit
On a 120 volt power supply, what color of wire is the hot leg
Black
How is alternating current generated
By moving a conductor through a magnetic field
What is the ability to store electrons in an electrical circuit called
Capacitance
What is the opposition to change in voltage in an AC capacitive circuit called
Capacitive reactance
What is the relationship of current and voltage in a capacitive circuit
Current leads voltage
On a 120 volt power supply, what color of wire is the grounded leg
Green
Frequency is measured in
Hertz
What is the total resistance of an AC circuit that is caused by inductive reactance, resistance, and capacitive reactance called
Impedance
On a 240 volt, 60 Hz single-phase power supply, where is a fuse necessary
In both hot legs
What is the generation of a voltage by the variance of the current flow rate in an AC circuit called
Inductance
What is the resistance in an AC circuit due to the change of current flow called
Inductance
What is the opposition to current flow in an AC inductive circuit caused by magnetic lines of flux called
Inductive reactance
On a three-phase power supply, what legs must be fused
L1, L2, and L3
The condition indicating the direction of electron flow is known as
Polarity
What is the resistance of the passing of magnetic flux lines through a substance called
Reluctance
What determines the frequency in an AC circuit
The amount of cycles that occur in a circuit in one second
On a 120 volt, 60 Hz power supply, what leg must be fused
The hot leg
What is the relationship of current and voltage in a resistive circuit
Voltage is in phase with current
What is the relationship of current and voltage in an inductive circuit
Voltage leads current
On a 120 volt power supply, what color of wire is the neutral leg
White
