Day 1 Notes

Question 1

Direct current flows

Answer 1

Continuously in a single direction, negative to positive (zero hertz)

Question 2

Square wave

Answer 2

Draw

Question 3

I(T)=max and I(T)=0

Answer 3

Draw on square wave

Question 4

Bcuz DC is “__________” in application, it is not suitable for ___________ ___________ _____________ ____________

Answer 4

Uni-directional

Long distance power distribution

Question 5

DC is directly effected by the

Answer 5

“Inverse square law”

Question 6

1

Answer 6

1

Question 7

The attractive force between 2 opposing electrically charged bodies(one positive one negative), ____________ ______________ to the square of the distance between them

Answer 7

Inversely proportional

Question 8

If the distance between positive and negative is doubled, the attractive force is

Answer 8

Four times weaker than

Question 9

DC power could only be used within _________ ___________ diameter of a power station

Answer 9

1/2 mile

Question 10

Wavelength also known as

Answer 10

LAMBDA…..draw symbol

Question 11

Wavelength defined

Answer 11

A measure of the distance from the beginning to the end of one AC cycle

Question 12

Wavelength is typically measured in

Answer 12

Meters

Question 13

LAMBDA=

Answer 13

Speed of light in meters per second

3 * 10 8squared / Frequency

Question 14

For miles what number would you use to calculate LAMBDA

Answer 14

186000 miles per second

Question 15

The higher the frequency

Answer 15

The shorter the wavelength

Question 16

The level/amount of AC produced is determined by the strength of the

Answer 16

Magnetic flux lines

The number of “turns” in the coil

Question 17

The speed at which the coil is rotated determines the

Answer 17

Frequency of the AC in “hertz”

Question 18

Transducer

Answer 18

Device that converts one form of energy into another form of energy ……mechanical energy

Question 19

What can you use to produce Alternating current

Answer 19

Transducer

Question 20

Electro-mechanical devices

Answer 20

Alternator
Generators

Question 21

Electro-mechanical devices: Alternator

Answer 21

Produces AC on a small scale

Car battery

Question 22

Alternator AC scale

Answer 22

13 to 15 VDC

Question 23

Electro-mechanical devices generators

Answer 23

Produce AC on a larger scale

Electrical distribution for homes and businesses

Question 24

Generator scale

Answer 24

400 to 40,000 VAC

Question 25

Electrical phase differentials

Answer 25

Single phase Two phase Threes phase

Question 26

More phases provide

Answer 26

More output power

Question 27

Single phase

Answer 27

Draw

Question 28

Two phase draw

Answer 28

Draw

Question 29

Three phase

Answer 29

Draw

Question 30

A phase leads B phase

Answer 30

Draw and identify

Question 31

If A leads B the B ________ A

Answer 31

Lags

Question 32

Digital oscilloscopes

Answer 32

Higher frequency response Stored waveforms for latter analysis

Question 33

2 equations to solve wavelength(Lambda

Answer 33

L=186000/Fre…… in miles L=300 * 10 6squared / Fre…….in meters

Question 34

The “distance” from the beginning to the end of a sine wine is

Answer 34

Wavelength aka LAMBDA

Question 35

What is based on a radio frequency or communications signal traveling over distance at the speed of light (186000 mi/sec)

Answer 35

LAmBDA wavelength

Question 36

The speed of light

Answer 36

186000 miles per second

Question 37

What is the “frequency” of a sine wave

Answer 37

The number of complete waves (rotations) created in one second

Question 38

Frequency equation

Answer 38

F=1/T (in hertz)

Question 39

Frequency in measured in

Answer 39

Hertz

Question 40

Time is measured in

Answer 40

Seconds

Question 41

pp means

Answer 41

Peak to peak

Question 42

Pk

Answer 42

Peak

Question 43

How do you get frequency

Answer 43

Final number of spins per sec

Question 44

AC test instruments

Answer 44

Oscilloscope (analog) Function generator DC offset Oscilloscope (digital)

Question 45

The oscilloscope (analog) provides

Answer 45

a graphic, visible image of a waveforms for analysis -voltage (P-P) -Period (time) -phase differential

Question 46

Function generator provides

Answer 46

A waveform of a known type, frequency, and amplitude for intersection and analysis in cycles per second (CPS) -sine waves-draw -square waves-draw -triangle waves-draw

Question 47

DC offset

Answer 47

A variable adjustment within a function generator to provide a DC output voltage Draw

Question 48

The father of alternating current

Answer 48

Nikola Tesla

Question 49

AC was the solution for to

Answer 49

Long distance power distribution

Question 50

Today _________ of all power is AC

Answer 50

99.999%

Question 51

The solution is in AC’s ability to

Answer 51

“Periodically” reverse direction or “Alternate” the flow of current

Question 52

Alternating current constantly changes in Over a specific intervals of time

Answer 52

Direction Amplitude or magnitude

Question 53

Alternating current is typically depicted as a

Answer 53

Sinusoidal waveform or sine wave

Question 54

AC power is produced by rotating a _______ _______ ________ through the ____________ of a magnetic field

Answer 54

Conductive medium (coil) Fluxlines

Question 55

When the coil interrupts the lines of flux, a voltage is “_________” in the coil

Answer 55

Induced

Question 56

Each quarter turn of the coil produces a ______ _______ of the sine wave

Answer 56

90 Degree Portion

Question 57

The average voltage of a complete sine wave is

Answer 57

Zero

Question 58

One cycle of AC is

Answer 58

One 360 rotation Draw

Question 59

Positive peak voltage is

Answer 59

0-90 degrees V pk+

Question 60

Negative peak voltage is

Answer 60

0 to 270 degrees V pk -

Question 61

Peak to peak voltage is

Answer 61

90 to 270 degrees V p-p

Question 62

Average voltage of an alternation

Answer 62

Peak voltage x .636 (63.6%)

Question 63

RMS

Answer 63

Root mean square

Question 64

RMS voltage

Answer 64

The effective or DV equivalent Voltage=Peak Voltage * .707 (70.7%)

Question 65

The period of a sine wave (T)

Answer 65

The amount of time required to create one “complete” sine wave T= 1 / F in seconds