ENE 104 Electric Circuit Theory - staff.kmutt.ac.th - kmutt
ENE 104 Electric Circuit Theory - staff.kmutt.ac.th - kmutt
ENE 104 Electric Circuit Theory - staff.kmutt.ac.th - kmutt
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<strong>ENE</strong> <strong>104</strong><br />
Example:<br />
AC <strong>Circuit</strong> Power Analysis<br />
Page 17<br />
Week #11<br />
v<br />
<br />
<br />
4cos<br />
t<br />
/<br />
6<br />
V. V = 4 0 o V.<br />
Z = 2 60 o ohm.<br />
Sol:<br />
The phasor current is V/Z = 2 -60 o<br />
So <strong>th</strong>e average power is:<br />
P<br />
<br />
<br />
i<br />
1<br />
VmI<br />
m<br />
cos( )<br />
2<br />
1<br />
(4)(2)cos(60)<br />
<br />
2<br />
<br />
2cos<br />
t<br />
/ 6 60<br />
2W
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