Bas Basic ic El Elec. ec. En Engr gr. . Lab Lab EC ECS S - - PowerPoint PPT Presentation

• Dr. Prapun Suksompong

prapun@siit.tu.ac.th

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Bas Basic ic El Elec.

• ec. En

Engr gr. . Lab Lab

EC ECS S 204 04/2 /210

Office Hours: BKD 3601-7 Tuesday 9:30-10:30 Friday 14:00-16:00

Lab 4

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 AC Circuit  Time-varying Signal  Oscilloscope  Function generator

Time-varying periodic signal (voltage)

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 Suppose the period is T.  Instantaneous value at time t:  Average value  RMS value  Peak value  Peak-to-peak value

 

v t

   

1

t T t

v t v t dt T







   

2 2

1

t T t

v t v t dt T







 

max

t t t T v t   

 

 

 

 

max min

t t t T t t t T v t

v t

     



 

V

 

V

p

V    

p p

V     

 

rms

V

Sinusoidal signal (voltage)

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 The period is  Instantaneous value at time t:  Average value  RMS value  Peak value  Peak-to-peak value

   

1

t T t

v t v t dt T







   

2 2

1

t T t

v t v t dt T







 

max

t t t T v t   

 

 

 

 

max min

t t t T t t t T v t

v t

     



 

V

 

V

p

V    

p p

V     

 

rms

V 1 2 T f    

   

cos v t A t      2 A  A  2A 

t v(t) T/2 T

Steady-State AC Analysis

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 Phasor Domain:  Time Domain: Z  V I Resistor Inductor Capacitor Z R  Z j L   1 Z j C  

“CIVIL”

Oscilloscope Preparation

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Released Released Released Pushed Pushed Released Released Released Released

Function Generator

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Demo 1

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 4 Vp-p Sinusoid

Part C

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R2 100 ohms Sine-wave generator Oscilloscope Ch-1 Ch-2

red red black black

Z1

Demo 2

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Midterm Results (20%)

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5 10 15 20 25 30 10 15 20 25 30 35 40 45 50 55 Student# Scores

10 15 20 25 30 35 40 45 50 55 60 1 2 3 4 5 6 7 8