R<sub>1</sub>和R<sub>2</sub>为两个串联电阻,已知R1=2R<sub>2</sub>, R<sub>1</sub>上消耗的功率与R<sub>2</sub>上消耗的功率之比为()
A、P1:P2=1:2
B、P1:P2=2:1
C、P1:P2=1:1
D、无法判断
A、P1:P2=1:2
B、P1:P2=2:1
C、P1:P2=1:1
D、无法判断
A、(R<sub>1sub>+R<sub>2sub>)/R<sub>1sub>R<sub>2sub> B、R<sub>1sub>R<sub>2sub>/(R<sub>1sub>+R<sub>2sub>) C、R<sub>1sub>+R<sub>2sub> D、R<sub>1sub>R<sub>2sub>
A、R<sub>1sub>与R<sub>3sub>串联后与R<sub>2sub>并联 B、R<sub>1sub>与R<sub>3sub>并联后与R<sub>2sub>串联 C、R<sub>1sub>与R<sub>2sub>并联后与R<sub>3sub>串联 D、R<sub>1sub>与R<sub>2sub>串联后与R<sub>3sub>并联
A、R<sub>1sub>>R<sub>2sub>>R<sub>3sub> B、R<sub>1sub><R<sub>2sub><R<sub>3sub> C、R<sub>1sub>>R<sub>3sub>>R<sub>2sub> D、R<sub>3sub>>R<sub>1sub>>R<sub>2sub>
A、r<sub>1sub>=r<sub>2sub>=0,L<sub>1sub>=L<sub>2sub>=M=0 B、r<sub>1sub>=r<sub>2sub>=0,L<sub>1sub>=L<sub>2sub>=M=∞ C、r<sub>1sub>=r<sub>2sub>=∞,L<sub>1sub>=L<sub>2sub>=M=0 D、r<sub>1sub>=r<sub>2sub>=∞,L<sub>1sub>=L<sub>2sub>=M=∞
A、R<sub>1sub>>R<sub>2sub>>R<sub>3sub> B、R<sub>1sub><R<sub>2sub><R<sub>3sub> C、R<sub>1sub>>R<sub>3sub>>R<sub>2sub> D、R<sub>2sub>>R<sub>1sub>>R<sub>3sub>
A、R<sub>1sub>烧坏,R<sub>2sub>不会烧坏 B、R<sub>1sub>、R<sub>2sub>均烧坏 C、R<sub>1sub>未烧坏,R<sub>2sub>烧坏 D、R<sub>1sub>、R<sub>2sub>均未烧坏
A、R<sub>1sub>>R<sub>0sub> B、R<sub>1sub><R<sub>0sub> C、R<sub>1sub>=2R<sub>0sub> D、R<sub>1sub>=R<sub>0sub>
A、顺磁质μ<sub>rsub>>0,抗磁质μ<sub>rsub><0,铁磁质μ<sub>rsub>>>1 B、顺磁质μ<sub>rsub>>1,抗磁质μ<sub>rsub>=1,铁磁质μ<sub>rsub>>>1 C、顺磁质μ<sub>rsub>>1,抗磁质μ<sub>rsub><1,铁磁质μ<sub>rsub>>>1 D、顺磁质μ<sub>rsub><0,抗磁质μ<sub>rsub><1,铁磁质μ<sub>rsub>>0
A、R<sub>1sub>>(R<sub>2sub>+R<sub>3sub>) B、R<sub>1sub><(R<sub>2sub>+R<sub>3sub>) C、无法确定 D、R<sub>1sub>=(R<sub>2sub>+R<sub>3sub>)
A、R<sub>1sub>>(R<sub>2sub>+R<sub>3sub>) B、R<sub>1sub><(R<sub>2sub>+R<sub>3sub>) C、无法确定 D、R<sub>1sub>=(R<sub>2sub>十R<sub>3sub>)