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 />
Average Power:<br />
AC <strong>Circuit</strong> Power Analysis<br />
Page 15<br />
Week #11<br />
In <strong>th</strong>e Sinusoidal Steady State<br />
v( t)<br />
V<br />
cos( t<br />
)<br />
m<br />
i( t)<br />
I cos( t<br />
)<br />
<strong>th</strong>e instantaneous power is<br />
m<br />
Or<br />
p( t)<br />
VmI<br />
m<br />
cos( t<br />
)cos(<br />
t<br />
)<br />
1<br />
1<br />
p( t)<br />
VmI<br />
m<br />
cos( )<br />
VmI<br />
m<br />
cos(2t<br />
<br />
)<br />
2<br />
2<br />
P 1<br />
<br />
m<br />
cos( )<br />
2<br />
V I m<br />
By inspection:
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