东南大学电子学院电路基础期末考试样卷及答案.pdf

Solve the following problems. (100 points) 1、( 6 points) Find Uab in the circuit in Figure 1. 0.5I 3k Ω + - a + I 6mA 2k Ω Uab - b Figure 1 2、( 8 points) Find u and i in the circuit in Figure 2. o o 20k Ω io + + - + + 80k Ω 1V 100k Ω uo - 10k Ω 50k Ω - Figure 2 3、( 6 points) In the circuit of Figure 3, readings of voltmeter V1 ，V2 and V3 ○ ○ ○ are 10V, 18V and 6V, respectively. Please determinate the reading of the voltmeter V . ○ V1 V2 a L C V R V3 b Figure 3 4、( 8 points) The resonant or tuner circuit of a radio is portrayed in Figure 4, s1 where u represents a broadcast signal, given that R=10 Ω， L=200 μH, U =1.5mV ，f =1008kHz. If the circuit is resonant with signal u , please s1rms 1 s1 determinate: (1) the value of C; (2) the quality factor Q of the circuit; (3) the current Irms; (4) the voltageUcrms. i R + L