AC Circuit Analysis Fourth Block

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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


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