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Power Elecronics 2 > Average RMS and Power > Flashcards

Average RMS and Power Flashcards

1
Q

What is the Peak value of the voltage

A

The maximum possible positive or negative value

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2
Q

What is the Peak to peak value of the voltage

A

Range between the minimum and maximum value

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3
Q

What is meant by the Average or mean value

A

Value you obtain if you smoothed the wave form

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4
Q

What is meant by the Root Mean Square value

A

Essentially a measure of the power in a resistive load

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5
Q

What is the integral to calculate the average value

A

X=1/T* (integral between 0 and T of x(t)dt)

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6
Q

What is the integral to calculate the RMS

A

X= 1/T*(integral between 0 and T of x(t)^2dt)

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7
Q

For a pure AC wave what is the RMS value equivalent to

A

Standard Deviation

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8
Q

What does the average value tell you bout steady current

A

How much steady current you need to pass through a component for the same amount of time as you pass a variable current, so that the same amount of charge gets transferred

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9
Q

What is the average power equal to

A

Pave=1/T *(integral between 0 and T of v(t)I(t)dt

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10
Q

What is the average power equal

A

Pave =Vdc*Idc

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11
Q

What are the 2 equations for average power in a resistive load

A

Pave=RIrms^2

Pave=v^2rms/R

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12
Q

At steady state current or Irms gives the same average power dissipation in a resistor as……???

A

The Varying current

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13
Q

R.M.S value is tells you how effective the wave is at what?

A

Dissipating power in a resistor

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14
Q

What is the equation for the RMS value of the current.

A

Irms= square root of (1/T*integral between 0 and T of I(t)^2 dt

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15
Q

What is the equation for the Vrms for a sine wave

A

Vrms=Vpk/square root 2

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16
Q

Is the equation for Vrms for a sine wave a general result

A

No, other waves have different RMS values

17
Q

Why is the Mains value stated as an RMS value and what is the RMS value and Peak value

A

Because the RMS value tells you about power being dissipated which is what is paid for
Vrms= 230V
Vpk= 325V

18
Q

What are the amplitude RMS values of Sin waves, Square Waves and Saw tooth functions

A

Sin waves= A/root 2
Square waves= A
Saw tooth waves= A/root 3

19
Q

What is the Vrms for a square wave with an amplitude +-Vo

A

Vo

20
Q

Full Wave rectification is the same as taking the…..

A

Absolute value (magnitude)

21
Q

What is the equation for a fully rectified sin wave

A

V(t)=Vpk|sinwt|

22
Q

What happens the frequency during rectification.

A

It is doubled

23
Q

For full wave Rectification what are the limits of integration

A

0 and T/2

24
Q

For a rectified sin wave what is the Vavg

A

Vavg=2/pi * vpk=0.64Vpk

25
Q

What is the Vrms for a rectified sin wave

A

Vrms=1/root2 *vpk=0.71 Vpk

26
Q

What must be true must be about Vrms and Vavg

A

Vrms is greater than or equal to Vavg

27
Q

What effect does full wave rectification have on the RMS value

A

No effect so the Vrms of a full rectified wave is Vpk/root 2

28
Q

What can be helpful when calculating averages

A

Symmetry

29
Q

What portion of the Period of the wave do you need to consider for a triangle wave

A

T/4

30
Q

For a square wave what is the Vr.m.s

A

Vr.m.s = Vpeak aka the amplitude of the square wave

31
Q

What is the equation relating Vavg and Duty cycle

A

Vavg = DVon + (1-D)Voff

32
Q

What is the equation relating Vr.m.s and duty cycle

A

Vr.m.s= square root of (DV^2on + (1-D)V^2off)

33
Q

For half wave rectification of a sin wave What is the integral for the Vavg

A

Vavg=(1/T) x intergrall of (Vosinwt) dt btween 0 and T/2

34
Q

For half wave rectification of a sin wave what is the Vr.m.s

A

Vr.m.s= Vo/2

35
Q

For full wave rectification of a sine wave what are the equations for Vavg and Vr.m.s

A 
Vavg = 2Vo/pi
Vr.m.s = Vo/(root 2)
36
Q

For a triangle wave how does the peak voltage relate to r.m.s voltage

A

Vpk = Vr.m.s x (root3)

Power Elecronics 2 (11 decks)

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