- #1
Kbob08
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Homework Statement
Detmerine the Power and rms value for each of the following signals:
a)5 + 10cos(100t+pi/3)
... more signals
The Attempt at a Solution
It's hard to right out integral signs or I don't know the way to do so I'll use I(lower bound, upper bound) to denote an integral
a)P= lim t->inf. (1/T) [I(-T/2,T/2) [5 + 10cos(100t+pi/3)^2dt]
=lim t->inf. (1/T) [25T + I(-T/2,T/2) 100 cos^2(100t+pi/3)dt + I(-T/2,T/2)50cos(100t + pi/3)dt->0
= lim t->inf. (1/T) [25T + 50T {I(-T/2,T/2)cos(200t+2pi/3)dt}->0
= 25 +50 = 75, Rms 75^ (-1/2)
does it look like I'm following the right idea?