由电路图知，两电阻并联在电源两端，电流表A1测流过电阻R1的电流，电流表A2测干路电流；（1）由欧姆定律得，电阻R1的阻值R1= U IA1 = 6V 0.2A =30Ω；（2）由并联电路特点知，流过电阻R2的电流I2=IA2-IA1=0.3A-0.2A=0.1A，由欧姆定律得，电阻R2的阻值R2= U I2 = 6V 0.1A =60Ω；答：电阻R1和R2的阻值分别为30Ω和60Ω．
