- #1
fahraynk
- 186
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Member advised to use the homework template for posts in the homework sections of PF.
Homework Statement
Problem is to find the half power frequencies of a RLC circuit.
Z = √(R2 + (WL-1/WC)2)
2. Homework Equations
Power(P) = V2/Z
Pmax = V2/R <---because Z min = R
The Attempt at a Solution
P/2 = V2/2R = V2/Z
Z=2R
(R2 + (WL-1/WC)2) = 4R2
(WL-1/WC)2 - 3R2 = 0
W2-3WR/L-1/LC = 0
Solve for w to get half power frequencies.
Book gets : W2+-WR/L -1/LC = 0
Cant figure out why Pmax is divided by sqrt(2) instead of 2
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