来自任俊杰的问题
.电阻R1和R2串联后接在电动势为E、内阻不计的电源上,现用有一定内阻的电压表分别测得R1与R2两端电压分别为U1和U2.若电压表的内阻与R1和R2相比:[]A.R1和R2均很小时,则U1+U2=E;B.R1和R2均
.电阻R1和R2串联后接在电动势为E、内阻不计的电源上,现用有一定内阻的电压表分别测得R1与R2两端电压分别为U1和U2.若电压表的内阻与R1和R2相比:[]
A.R1和R2均很小时,则U1+U2=E;B.R1和R2均很大时,则U1+U2=E
C.R1和R2均很小时,则U1+U2<ED.R1和R2均很大时,则U1+U2<E
1回答
2020-01-31 20:02