问题
问答题
两个电阻R1、R2并联,若其总电阻为R,请你根据欧姆定律和并联电路的电流、电压特点,试证明:
=1 R
+1 R1
.1 R2
答案
∵I=I1+I2,I=U R
∴
=U R
+U1 R1 U2 R2
又∵U=U1=U2
∴
=1 R
+1 R1
.1 R2
两个电阻R1、R2并联,若其总电阻为R,请你根据欧姆定律和并联电路的电流、电压特点,试证明:
=1 R
+1 R1
.1 R2
∵I=I1+I2,I=U R
∴
=U R
+U1 R1 U2 R2
又∵U=U1=U2
∴
=1 R
+1 R1
.1 R2