Please help and show work, keep getting wrong.?
回答 (2)
Please show you work and thus we will know how you keep getting wrong and how to help you.
Not all , just the major part of ....
1)
Pls see the enclosed sketch
A = 0.035m^2 = 350 cm^2 = 350/2.54^2 = 54.25 square inches = PI*R^2
R = √ 54.25/3.1416 = 4.16''
H = 22/2.54 = 8.66''
L = 45*10^3 μ H
N = √ 45*10^3*(9*4.16+10*8.66)/4.16^2 = 568 turns
2)
turns ratio k = 18
V2 = V1/k = 120/18 = 10*2/3 = 20/3 of volt (≅ 6.67)
4)
timeconstant T = L/r = 3000/8 = 375*10^-6 sec
I2 = V/R*(1-e^-(200/375) = 0,5*(1-2.7182818^-(200/375) = 0.207 A
I1 = V/R*(1-e^-(100/375) = 0,5*(1-2.7182818^-(100/375) = 0.117 A
aver. induced emf = E = V-(r*(I1+I2)/2) = 40-80*(0.207+0.117)/2 = 27.0 V
aver. voltage across res. Δ V = V-E = 40-27 = 13.0 V
5)
ω = 120PI = 377 rad/sec
Xc = 10^6/(377*120) = 22.10 ohm
Xℓ = 377*50*10^-3 = 18.85 ohm < Xc (current will be leading)
impedance Z = √ R^2+(Xc-Xℓ )^2 = √ 18^2+(22.10-18.85)^2 = 18.3 ohm
Ipeak = V/ Z = 120/ 18.3 = 6.56 A
Irms = Ipeak /√2 = 6,56/1.41 = 4.65 A
leading angle = arctan (Xc-Xℓ ) / R = arctan 3.25/18 = 10.2°
peak voltage across capacitor = Xc*Ipeak = 22.1*6.56 = 145 V
rms voltage across capacitor = Xc*Irms = 22.1*4.65 = 103 V
收錄日期: 2021-04-18 18:35:41
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