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1
Q

When the inductor de-energizes, what is the amount of remaining current after 2 time constants?

A

14%

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2
Q

How many time constants does it take an inductor to reach maximum current?

A

5

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3
Q

In an RL circuit, what is the percent of current growth after 3 times constant

A

95%

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4
Q

During discharging, what is the percent of full charge after 2 time constants

A

14%

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5
Q

RC time constants indicate the

A

rate of charge or discharge of a capacitor

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6
Q

When the input frequency is set to fCO, what will be the output voltage in an RC filter current

A

VMAX * .707

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7
Q

If a high pass filter circuit uses a 3.3k ohm resistor and a .045uF capacitor, what is fCO

A

1.07 hz

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8
Q

Which figure is an RC high pass filter?

A

Draw

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9
Q

Which figure is an RC low pass filter

A

Draw

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10
Q

In a low pass RC filter, the output voltage increase as

A

Frequency decreases

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11
Q

The best method to check out an RC filter circuit is to compare measured and calculated

A

fCO

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12
Q

Filters pass or block

A

Frequency

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13
Q

The basis of an RC filter is

A

Capacitive reactance

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14
Q

What is the point called where an input signal changes from passed to block in an RC filter circuit

A

Half power point

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15
Q

In an RC low pass filter, Most of the input signal is shunted to ground by the _______ ____________, and not passed to the _________.

A

low reactance

output

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16
Q

high pass filter. It passes_________ frequencies while blocking_______ frequencies.

A

High

Low

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17
Q

Low pass filter, passes _______ frequencies while blocking ________ frequencies

A

Low

High

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18
Q

RC filters come in 2 different t configurations

A

High pass filter

Low pass filter

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19
Q

What does an RC filter block or pass?

A

Frequency

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20
Q

The resistance of a resistor______ _______ change when the input frequency changes.

A

Does not

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21
Q

as frequency increases, capacitive reactance_________.

A

Decreases

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22
Q

as frequency increases, capacitive reactance_________.

A

Decreases

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23
Q

operation based on how the capacitor reacts to different frequencies is called.

A

capacitive reactance

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24
Q

RC filter is a circuit constructed from __________ and __________ that will block certain frequencies and pass others

A

Capacitors

Resistors

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25
What functional area controls the intensity
Display
26
What functional area controls the sweep?
Horizontal
27
On the display the horizontal axis represents
Time
28
The phase angle of a displayed waveform is a derived quantity measured in
Degrees
29
Which type of vertical coupling will block any input from being displayed for the selected channel
GND
30
Oscilloscopes probes are connected to which functional area
Input
31
Which functional area controls the amplitude
Vertical
32
Oscilloscopes can be used to derive frequencies by measuring
Time per cycle
33
What is the trace on an oscilloscope
Shape of the waveform
34
Which quantity can an oscilloscope measure
Voltage
35
Most oscilloscopes directly measures waveform shape,
Voltage and time
36
Most common oscilloscopes have how many traces
2
37
The greater the distance between the plates of a capacitor, the
Less it’s capacitance
38
The capacitance value of a capacitor of 15pF
15 picofarads
39
A 25 microfarad capacitor with a working voltage limit of 40 vdc is labeled
25uF 40 WVDC
40
The ability of a capacitor to store a charge is called
Capacitance
41
Select the highest capacitance value
Write values
42
Capacitors are found
In both AC and DC circuits
43
A capacitor is used to store an
electrical charge
44
The insulating material of a capacitor, which cannot conduct is called
Dielectric
45
The basic capacitor is made up of
2 mental plates separated by a dielectric
46
Capacitor symbols
Draw
47
The ability of an inductor to concentrate a magnetic field is called
Inductance
48
Which formula is used to calculate the RMS voltage of a sine wave?
.707 * Peak value
49
Which sine wave has a peak value of 20 volts?
Draw
50
A non-standard cycle
Begins at any point other than 0 degrees and completes a 360 degree cycle
51
A magnetic field is developed when
current flows through a conductor
52
The magnetic field around a conductor carrying high current
Obeys left hand rule Allows for high induction Expands outward from the center
53
Which is needed to induce current
Conductor Magnetic field Relative motion
54
Induction occurs when
A conductor passes through a magnetic field
55
Fewer flux lines create a__________ magnetic field and allow for________ induction.
Weaker Lower
56
More flux lines create a__________ magnetic field and allow for_________ induction.
Stronger Higher
57
If the flux variation is high, induction is high and a larger amount of__________ is produced
current
58
Induction
is the generation of AC current by changing a magnetic field (flux variation).
59
The period of a wave is the
Time for one complete cycle
60
Wavelength is expressed in
Meters
61
Wavelength is the
Distance from start to end of one cycle
62
Which has the shortest wavelength
100k hz <100 hz
63
With a frequency of 500hz , what is the period of a wave
.002 seconds
64
Alternating current is produced by
Generator
65
One cycle of a sine wave always has
One positive and one negative alternation
66
Hz is the same as
Cycles per second
67
Wavelength
Distance,LAMBDA, LAMBDA symbol,
68
Three characteristics needed for sine wave calculations are
Frequency Period Wavelength
69
Frequency is measured in
Cycles per second Hertz
70
The sine wave is a representation of
Voltage or current
71
The AC power in your home is 60 hz. How many cycles per second is that
60
72
The AC power in your home is 60 hz. How many cycles per second is that
60
73
Sine waves are measured in
Frequencies
74
One cycle of AC always completes two.
alternations
75
This sine wave completes one cycle of AC.
voltage and current

AC Circuit Notes (8 decks)

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