Guys this is what I did, and what other people also got, but my hoemwork engine
ID: 2070710 • Letter: G
Question
Guys this is what I did, and what other people also got, but my hoemwork engine won't let me put through and keep on telling me that it's wrong..... I only have 2attempts to submit the answers.. can you please verify where I'm(we're) doing wrong?
power means the real power delivered
I = 120/(385-668 j)
I = 120/(772/_ -60.04)
I = .156/_60.04
P = VxI*
P = 120*.156/_-60.04
P = 18.72*cos-60.04 + 18.72*sin-60.04
P = 9.3486 - 16.218 W
average power supplied ==> active power
Psupplied = Pdissipated = 9.3486 W
We also tried
average power = Vm Im cos?/2
= (Vm/?2)(Im/?2)cos?
= VI cos?
this can also be written as P = I^2 *Z cos?
=====================also tried=========================
X = (2pi fL) - (1/2pifC) = -668?
Z =?(R^2 + X^2) = 772?
I = V/Z = 0.156 A
power by source = VI = 120*0.156 = 18.72 W
power dissipated = I^2*R = 0.156*385 = 9.37 W
(rest power is stored in the inductor)
Explanation / Answer
Current lowing in circuit = 120/[385 + j (wL - 1/wC)]
I= 120 / [385 + j(28.75 - 5333.33)] = 120 / 385 - j5304.58 = 0.0226<85.84°
Now Power= I^2 *R = (0.0226)^2 * 385 = 0.197 Watts
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