PHY1520L       AC Circuits Pre-Lab Week 2      Name:

 

 

 

1.   30%   Identify of the magnitudes of voltages & phase angle for the given phasor diagram. 

(Please refer to Figure 12-8          Scale:  1 cm à 0.1 A:  VR   = 2.4cm (0.1V/cm) = 0.24 V

B:  V__ =

C:  V__ =

D:  V__ =

E:  V__ =

Φ:

 

2.  35%     On the reverse of the page, please determine the “phase” angle, Vr, VL, phase of VrL, by constructing a phasor diagram.                Scale:  3 cm ~ 0.1 Volts

VR      = 0.133 V        

VC      = 0.383 V

VLr     = 0.405 V

VLrC    = 0.066 V

VRLrC   = 0.199 V  

3.   35%  Plot both log VC & log VLr vs log freq.   Find the frequency where these lines intersect.

freq

log freq

VC

log VC

VLr

log VLr

120

 

0.296

 

0.487

 

45

 

0.799

 

0.180

 

65

 

0.559

 

0.262

 

90

 

0.433

 

0.339

 

150

 

0.238

 

0.604