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[主观题]
N由电阻组成,图(a)中,I2=0.5A,求图(b)中的电压U1。
N由电阻组成,图(a)中,I2=0.5A,求图(b)中的电压U1。
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A.i1 = (ua - ub)/R1=0.5A i2 = (uc - ub)/R2=-1.5A i3 = ub/R3=0.5A
B.i1 = (ua - ub)/R1=1A i2 = (uc - ub)/R2=-0.5A i3 = ub/R3=0.5A
C.i4 = (ua – uc)/R4=0.6A i5 =i1 + i4=1.6A i6 =i2 - i4= - 1.1A
D.i4 = (ua – uc)/R4=1.6A i5 =i1 + i4=1.2A i6 =i2 - i4= - 1.2A
(1)若要求二次谐波减小至0.1V,如何引反馈,反馈系数为多少?反馈电阻如何取值?
(2)引入反馈后,如要求其波输出仍为10V,应采取什么措施?
A.0.36A
B.0.2A
C.0.5A
D.0.4A