A.U>I(R1+R2) |
B.U=I(R1+R2) |
C.P<I2(R1+R2) |
D.P=U2/(R1+R2) |
A.当滑片向左滑动时,电压表的示数增大,但与外电阻不成正比 |
B.当滑片向左滑动时,电流表的示数减小,且与外电阻成反比 |
C.当滑片在最左端时,电压表的示数不等于电动势 |
D.当滑片在最右端时,电压表的示数等于电动势 |
A.a灯变亮,b灯变暗 | B.a灯变暗,b灯变亮 |
C.a灯先变亮后变暗 | D.b灯先变亮后变暗 |
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