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AC Circuit Notes > The Guide > Flashcards

The Guide Flashcards

(60 cards)

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1
Q

In AC circuits R becomes

A

Z

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2
Q

Always discharge a capacitor through an

A

Insulated probe

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3
Q

3 E (volts) equations

A

I * R

P “Squared” / I

“Square root” of P * R

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4
Q

3 I (current) equations

A

E /R
P / E
Square root of P / R

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5
Q

3 R (resistance) equations

A

E / I

E “squared” / P

P / I “squared”

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6
Q

3 P (watts) equations

A

E * I

E”squared”” / R

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7
Q

Time Constants (Tc) equations for Tc

A

L / R

R * C

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8
Q

Time Constants (Tc) equations for R

A

L / Tc

Tc / C

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9
Q

Time Constants (Tc) equations for L

A

Tc * R

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10
Q

Time Constants (Tc) equations for C

A

Tc / R

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11
Q

Magnetism terms

A

Permeability- easily magnetized
Retentivity- stays
Temporary- only through source

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12
Q

Transformer types

A

Step up

Step down

Isolation

Center tapped

Draw

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13
Q

Max power transfer

A

Z(in) = Z(out)

Pp=Ps

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14
Q

Capacitors are rated by

A

Farads and working voltage

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15
Q

Capacitance

A

The ability to store an electrical charge

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16
Q

Capacitors are discharged

A

Through a resistive load

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17
Q

Types of AC waveforms

A

Draw

Square
Triangle
Sine
Peak
Peak to peak
RMS
AVG

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18
Q

RMS equation

A

Pk * .707

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19
Q

AVG equation

A

PK * .636

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20
Q

Frequency equations

A

F = 1 / T (in Hz)

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21
Q

Period equation

A

T= 1 / F (in seconds)

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22
Q

Wavelength equation

A

300 * 10(6 squared) / F (in distance)

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23
Q

Turns ratio defined

A

Turns in primary vs turns in secondary

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24
Q

Ratio turns equation for primary

A

Ip = Is * Es / Ep

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25
Ratio turns equation for secondary
Is = Es / R(L)
26
Transformer troubleshooting
Shorts Opens Partial shorts
27
Resonance defined
Frequency at which XL(inductors) equals XC (capacitors) and only R remains
28
At resonance impedence is
Low
29
Low pass filter
Draw
30
High pass filter
Draw
31
RL circuits what leads what?
ELI Volts leads current by 90 degrees
32
RC circuits what leads what?
ICE Current leads voltage by 90 degrees
33
How to get voltage with multi meter
Meter in parallel for voltage Power on
34
How to get current with multimeter
Meter in series for current
35
How to get ohms with multi meter
Meter in parallel and no power
36
Series inductor equation
LT=L1+L2+L3………
37
Series capacitance equation.
CT= 1/ (1/C1+1/C2+1/C3……..)
38
Parallel inductor equation
LT=1/(1/L1+1/L2…….
39
Parallel capacitance equation
CT=C1+C2+C3…….
40
CEMF defined
(Counter electromotive force) A result of a changing current through an inductor
41
Time constants require __________ to fully charge or energize
5 Tc
42
Types of filter circuits
Draw Band stop Band pass High pass Low pass PI
43
Types of filter circuits
Draw see pictures Band stop Band pass High pass Low pass PI
44
In a series RC circuit what leads what
ER leads EC EC lags ER
45
In a series RL circuit what leads what
ER lags EL EL leads ER
46
Transformers do what
Transfer power
47
Isolation transformers do what?
Prevent electrical shock from chassis
48
Transformers step down are
High voltage to low
49
Transformers step up are
Low voltage to high
50
Transformers center-tapped are
Split secondary
51
Use ground to
Zero scope
52
Use ground to
Zero scope
53
Instantaneous voltage equation
S in (degrees) * Pk
54
When Zin =Zout this means
Maximum power is transferred
55
If current and voltage are in phase
The power factor = 1 (purely resistive)
56
If current and voltage are out of phase the
Power factor (purely reactive) = 0
57
If current and voltage are in and out of phase
Power factor is less than 1
58
Standard generator waves
Sine Square Triangle
59
Purely capacitive
ice by 90 degrees
60
Purely inductive
ELI by 90 degrees

AC Circuit Notes (8 decks)

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