两电阻串联电路,已知R1:R2=1:2.则下列说法正确的是(____)。
A两电阻电流之比I1:I2=1:2$;$两电阻电压之比U1:U2=1:2$;$两电阻功率之比P1:P2=1:2$;$两电阻电流之比I1:I2=1:1
B两电阻电流之比I1:I2=1:2$;$两电阻电压之比U1:U2=1:2$;$两电阻功率之比P1:P2=1:2$;$两电阻电流之比I1:I2=1:1
C两电阻电流之比I1:I2=1:2$;$两电阻电压之比U1:U2=1:2$;$两电阻功率之比P1:P2=1:2$;$两电阻电流之比I1:I2=1:1
D两电阻电流之比I1:I2=1:2$;$两电阻电压之比U1:U2=1:2$;$两电阻功率之比P1:P2=1:2$;$两电阻电流之比I1:I2=1:1