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Het spanningsverschil tussen P en Q is:

a   8 V
b  2 V
c   4 V
d   0 V

U/R1 = I1 = 10/100= 100 mA
U/R2 = I2 = 10/50   = 200 mA

U over 60 ohm is 100m x 60 = 6V

P = 10 - 6 =  4V

U over 20 ohm is 200m x 20 = 4V
Q = 10 - 4 =  6 V

Upq = Up - Uq = 4 - 6 = - 2V

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U=I*R