AC Circuit Analysis Fourth Block
Two inductors, 100H and 200H are connected is series, what is the total inductance?
300H
The strength of an electromagnet is primarily proportional to its _____.
Ampere-Turns
A basic law of magnetism states that unlike poles _____ and like poles _____.
Attract, Repel
Nonpolarized capacitors ___
Can be used with AC or DC
Electrons can form spin patterns that _____ the magnetic field of the material.
Cancel
A device that opposes a change of voltage is a(n) _____.
Capacitor
Each complete waveform of 360º is called a _____.
Cycle
The regions formed in the molecular structure of magnetic metals is sometimes called magnetic _____.
Domains
A term used to indicate the same value as the RMS value is the _____ value.
Effective
A magnet that produces a magnetic field as long as current is flowing is called a(n) _____ magnet.
Electromagnet
When a conductor cuts magnetic lines of force, a voltage is induced into the conductor. This principle is called _____.
Electromagnetic Induction
Magnetism can be explained in terms of _____ spin patterns.
Electron
The farad is symbolized by the letter _____.
F
The unit capacitance is the _____.
Farad
A charge curve for a capacitor is divided into _____ time constants.
Five
Magnetic lines of force are called _____.
Flux
The unit of inductance is the _____.
Henry (H)
The unit of frequency is _____.
Hertz (Hz)
When a magnetic field continually changes magnitude and direction, a voltage is continually being induced in the coil. This voltage is called _____ voltage.
Induced
Circuits are generally considered to contain _____ when any type of load that contains a coil is used.
Inductance
The symbol X L stands for _____.
Inductance Reactance
In a pure inductive circuit, current _____.
Lags voltage by 90 degrees
In a capacitor, the current _____ the applied voltage.
Leads
In a capacitor, the current _____ the applied voltage by _____.
Leads, 90 degrees
In some capacitors there is a small amount of current that flows from one plate, through the dielectric material to the other plate. This current is called _____ current.
Leakage
Man-made permanent magnets retain their magnetism _____ than natural magnets.
Longer
Lodestone is a name for a naturally occurring magnetic material that is also called _____.
Magnetite
The unit of capacitive reactance is the _____.
Ohm
The maximum point of a waveform is called the _____.
Peak
_____ do not require any power of force to maintain their field.
Permanent Magnet
The measure of a material's ability to be magnetized is called _____.
Permeability
A capacitor is constructed by separating two metal conductors called _____ with an insulating material called a(n) _____.
Plates, Dielectric
_____ is the square root of the mean of the square of the instantaneous currents.
RMS
The current-limiting property of a capacitor is called _____.
Reactance
The voltage rating of a capacitor _____.
Relates to the maximum voltage that should be applied to it
The measure of a material's resistance to magnetism is _____.
Reluctance
The amount of magnetism left in a material after the magnetizing force has stopped is called _____.
Residual Magnetism
If a voltage is being induced into a conductor by electromagnetic induction, reversing the direction of motion of the conductor will _____.
Reverse the polarity of the induced voltage.
The most common of all AC waveforms is the _____ wave.
Sine
The north magnetic pole of a compass needle is attracted to the _____ magnetic pole of the earth.
South
The symbol for capacitive reactance is _____.
XC
Increasing the surface area of the plates will cause the capacitance of a capacitor to _____.
Increase
When a magnetic materials molecules are all lined up, and increases in current flow no longer cause increases in magnetic field strength, the material has reached _____.
Saturation
Rotating machines normally produce a waveform called a _____ wave.
Sine
The amount of voltage induced into a conductor depends on the turns of wire, the strength of the magnetic field, and the speed of cutting action.
True
Polarized capacitors _____.
must be used with DC only
