多种方法测电阻——知识总结一：伏安法RxVSabPARx=U/I二、安阻法1.双安法（两+定值电阻）ARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRmARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRmARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRmI1×Rx=I2×R0I1×R0=(I2-I1)×RxI1×Rx=(I2-I1)×R02.单安法1)形式1：（一个+定值电阻+开关）ARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRmARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRmARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRm仅S、S1闭合I1S1闭合，I1S1闭合，I1仅S、S2闭合I2S1断开，I2S1断开，I2I1×Rx=I2×R0I2×Rx=(I1-I2)×R0I2×R0=(I1-I2)×Rx2)形式2：（一个+定值电阻+开关）ARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRmARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRmS1闭合，I1S1闭合，I1S1断开，I2S1断开，I2I1×R0=I2×(R0+Rx)I1×Rx=I2×(R0+Rx)3)形式3：安滑法（一个+滑动变阻器或电阻箱）ARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxR0RxR0V1V2RxVR0RxR0RxVR0VRxabPARxabPVRxabPV滑动变阻器在最大值和0RxVabPASS1S2S2SSSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSSSS1S1S1S2RmRmRmRxRxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表开关法RxR0RxVR0VRxVR0RxVR0RxR0RxR0VRxVR0RxR0RxVR0VRxabPARxabPV滑动变阻器在最大值和0ASS1S2S2SSSSSSSSS1S1S1S1S1SSSSSSSSSSSSSS1S1S1S2RmRmRxR0RxR0SV2V1RxR0RxR0SRxR0RxR0SV2V1V1V2RxASR1R2RxVSR1R2I1I2U1U2RxSVR1R2U1U2AAabPabP滑片最大阻值处，I1；电阻箱第一次为R1，I10Ω处，I2第二次为R2，I2I1×(Rm+Rx)=I2×RxI1×(Rx+R1)=I2(Rx+R2)三、伏阻法1、双伏法(两+定值电阻)ARxARxVVabPabPRxabPVRxAabPR0RxR0RxR0RxA1A2A1A2A1A2R0RxAR0RxARxR0ARxR0AR0RxARxVR0等效法安安法电流表...
