作业帮如图
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参考答案\x09若爱,请深爱；若弃,请彻底.
XL = ωL = 314 * 20 * 10^-3 = 6.28 Ω
tg30° = XL / R
R = XL / tg30° = 6.28 / 0.577 = 10.88 Ω
Z = √(6.28^2 + 10.88^2) ≈ 12.56 Ω
U = I * Z = 5 * 12.56 = 62.8 V
u = 62.8√2 sin314t
S = U * I = 62.8 * 5 = 314 VA
P = S * cos30° = 314 * 0.866 = 271.9 W