Chapter 14-18 AC Circuits
Lags voltage by 90 degreea
In a pure inductive circuit, current ___ ___ ___ ___ ____.
Pythagoras
In a right triangle, the sum of the squares of two sides is equal to the square of the hypotenuse. This was discovered by a Greek named _____.
True, Apparent
Power factor (PF) is the ratio of the ____ power to the ____ power.
Thrust
When using the left-hand generator rule, the thumb points to the direction of ______.
Vector
A line that indicates both magnitude and direction is a ____.
90 degrees
A right angle is and angle of _____.
5 ft
A right triangle has a hypotenuse of 10ft and one angle of 30 degrees. How long is the side opposite the angle?
51.34
A right triangle has one side of 5 and another side of 4 (neither side is a hypotenuse). What is the angle adjacent to the side that is 5?
Triangle/triangle
A wave in which the voltage rises at a constant rate with respect to time is a _______ wave.
True
If current is flowing in a circuit containing an inductor and the power switch is opened, the magnetic field surrounding the inductor collapses and induces voltage into the inductor, resulting in a voltage spike.
Hypotenuse
In a right triangle, the longest side is called the _____.
Opposite side
In a right triangle, the side across from an angle( the side is not one of the two that make the angle) is called the ____ ____.
Adjacent side
In a right triangle, the two non-right angles are each formed by the hypotenuse and one of the other sides. From the perspective of the angle, the side that is not the hypotenuse is called the ____ ____.
Sine
Rotating machines normally produce a waveform called a _____ wave.
A^2+B^2=C^2
The Pythagorean theorem is ____.
Zero to the peak
The amplitude of a waveform is measured from ____ ___ ___ ____.
Reactance
The current-limiting property of a inductor is called____.
Center finger current
The direction of induced current can be determined by using the _____ _____ _____ left-hand generator rule.
Peak
The maximum point of waveform is called ___.
SOH CAH TOA
The memory aid to help you remember the trigonometric function relationships is ___ ____ ___.
Sine
The most common of all AC waveforms is the ____ waves.
Frequency
The number of cycles completed in one second is called _____.
Hypotenuse
The side of a right triangle that is opposite the right angle is called the _____.
Inductance Reactance
The symbol XL stands for ____ ____.
X
The symbol for reactance is ___.
Henry(H)
The unit of inductance is the _____.
Watts
The unit of measure of the power delivered to the load in a DC circuit is ___.
Surface Area
To help overcome the problem of skin effect in High-frequency circuits, conductors with a large amount of _____ ____ must be used.
Reactive power
Volt-amperes-reactive is used to measure the ____ ____ in a pure inductive circuit.
Lenz's Law
When a closed loop of wire cuts through magnetic flux lines, a current is induced into the loop. The current in the loop sets up a magnetic field that is in opposition to the original magnetic flux. This is essentially _____ _____.
Current
When using the left-hand generator rule, the center finger points to the direction of ______.
RMS
_____ is the square root of the mean of the square of the instantaneous currents.
0.25
A coil has an inductance of 3 H and a wire resistance of 15 ohms. How long will it take for the current to reach its full value? ______
75
A right triangle has a hypotenuse of 87 and one side that is 44. How long is the other side?
14 in
A right triangle has one angle that is 60 degrees. The side adjacent to the 60 degree angle has a length of 7 inches. How long is the opposite side?
15
A right triangle has two sides that are 9 inches and 12 inches. How long is the hypotenuse?
Effective
A term used to indicate the same value as the RMS value is the ____ value.
True
A triangle wave is waveform in which voltage rises at a co start rate with respect to time.
Right
A triangle which contains one 90 degree angle is called a(n) _____ triangle.
Left-Hand Generator rule
A way of determining the relationships of the motion of the conductor, the magnetic field direction, and the direction of the induced current is by using the _____ _____ _____.
Voltage spike
A(n) _____ _____ may occur when the current flow through an inductor stops and the current also decreases at an exponential rate
Resistive
A(n) _____ load contains pure resistance.
Lenz's Law
An induced voltage opposes the motion that causes it according to _____ _____.
Inductance
Circuits are generally considered to contain ____ when any type of load that contains a coil is used.
Current
Dividing the circuits total implied voltage by the total impedance results in ____.
Cycle
Each complete waveform of 360 degrees is called a ___.
Opposite
If a conductoe is moved upward, the polarity of induced voltage is reversed and the current flows in the ____ direction.
Disrupt and collapse the circuit
If a voltage is being induced into a conductor by electromagnetic induction, reversing the direction of motion of the conductor will ___ ___ ___ ____ ____.
Average
If an AC waveform is rectified and converted into DC, the voltage value that results is the ____ value.
True
In a DC circuit, the product of volts times the amperes is called _____ power.
Power factor
In a series RL circuit, the angle between the voltage and current is called angle theta. The cosine of the angle is equal to the _____ ____.
Impedance
In a series circuit, the total _____ is equal to the sum of the individual resistors.
Eddy Current & Hysterisis
Losses in the core of iron core inductors include _____ _____ and ____ losses.
VA
Of the different power values in an RL circuit which is know as apparent power?
VARs
Of the different power values in an RL circuit which is known as wattless power?
VARs
Of the different power values in an RL circuit, which is know as quadrature power?
Metal oxide resistors
One device used to spike suppression in either direction or alternating current circuits is the ______ _____ _____.
Parallelogram
One method of adding two vectors that originate at the same point is the _____ method.
VARs
Reactive power of an inductor has the symbol of ____.
Oscillators
Square waves are generally produced by electronic devices called ____.
Skin
The ____ effect occurs when AC induced eddy currents into the conductor, which causes the electrons to be repelled toward the outer surface of the conductor.
Quality
The amount of resistance compared with the inductive reactance determines the ____ of the coil.
True
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.
Flemings
The direction of induced current can be determined by using the ______ left-hand generator.
Cosine
The function that is equal to the adjacent divided by the hypotenuse is the ____.
Sin
The function that is equal to the opposite divided by the hypotenuse is the ___.
1
The magnetic quantity Weber (Wb) is equal to 100,000,000 lines of flux. If a conductor cuts through one Weber per second, then a voltage of ____ volts(s) is induced into the conductor.
R-1
The time required for current in an inductor to reach its full Ohm's Law value is called the ______.
Impedance
The total current-limiting effect is called ____.
hertz
The unit of frequency is _____.
Henry
The unit of inductance is the _____.
Vector
Vectors must be added using ___ addition.
216 V
What is the average voltage of a full-wave rectified 240 V RMS AC voltage?
Ripples
When AC voltage is rectified and converted into DC, the resulting waveform is normally not pure, flat DC. The pulses that occur are called ____.
Electromagnetic Induction
When a conductor cuts magnetic lines of force, a voltage is induced into the conductor. This principle is called ______ ______.
Induced
When a magnetic field continually changes magnitude and direction a voltage is continually being induced in the coil. This voltage is called ____ voltage.
In Phase
When current rises and falls at the same rate as the voltage and reverses the direction of flow when the voltage reverses polarity, the current is said to be ____ ______ with the voltage.
Oppose
Inductors always ____ a change in current.
