RLC(R为灯泡),串联电路发生谐振,现在将电源的频率增加一倍,电源电压不变,则灯泡的亮度
谐振时,电路阻抗 Z = √[ R^2 + ( XL - XC )^2 ] = √[ R^2 + 0 ];
电源频率增加一倍,XL' = 2XL,XC' = XL/2,
Z1 = √[ R^2 + ( 2XL - XL/2 )^2 ] = √[ R^2 + ( 9/4)XL^2 ] > Z ;
故电流减小,灯泡变暗 。
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谐振时,电路阻抗 Z = √[ R^2 + ( XL - XC )^2 ] = √[ R^2 + 0 ];
电源频率增加一倍,XL' = 2XL,XC' = XL/2,
Z1 = √[ R^2 + ( 2XL - XL/2 )^2 ] = √[ R^2 + ( 9/4)XL^2 ] > Z ;
故电流减小,灯泡变暗 。