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(a)、根据电压
三角形,确定 u = v(50^2-40^2) = 30V,电流 i = u/Xc = j30A,电流i超前u90度;
(b)、根据电流和
阻抗,确定 u = 30x2 = 60V,电阻电流 ir = u/50 = 1.2A,睁绝纳总悉没电流 i = v(1.2^2+2^) ≈ 2.33A;
(a)、根据电流和阻抗,确定电容上的电压 uc = 30x1 = 30V,电感宏缺电流 il = u/XL = 30/15 = 2A,总电流 i = 2-1 = 1A。电阻上的电压 ur = 40x1 =40V,总电压 u = v( ur^2+Ul^2) = v(30^2+40^2) = 50V。所以,该电路中有效值 u = 50V,i = 1A。(a)30V 3A (b) 60V 2.1A (C)30V 2.2A