（2012?杨浦区一模）如图所示的电路中，电源两端电压为6伏保持不变，定值电阻R1的阻值为10欧，滑动变阻器 （2012?房山区一模）如图所示的电路中，电源两端电压U保持...
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由实物电路图可知，两电阻串联，电压表测R1两端的电压，电流表测电路中的电流．①当滑片位于b端时，电阻R1与滑动变阻器的最大阻值串联，此时电路中的电流最小、电压表的示数最小，
∵串联电路中的总电阻等于各分电阻之和，
∴电路中的最小电流Imin=
| U |
| R1+R2 |
| 6V |
| 10Ω+50Ω |
电压表的最小示数U1min=IminR1=0.1A×10Ω=1V；
②当滑片位于a端时，电路为R1的简单电路，此时电压表测电源的电压为U1max=6V，
电流表的最大示数Imax=
| U |
| R1 |
| 6V |
| 10Ω |
∴电压表的示数变化范围为1V≤U1≤6V；
电流表的示数变化范围为0.1A≤I≤0.6A．
答：①电压表的示数变化范围为1V≤U1≤6V；
②电流表的示数变化范围为0.1A≤I≤0.6A．
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