Several resistors

We have a box with the same resistors, so all of them have a resistance value of 200 ohms. Draw the connection of several resistors so that the resulting resistance is: a) 100 b) 120 (only 4 resistors)

Correct answer:

R1 =  100 Ω
R2 =  120 Ω

Step-by-step explanation:

R=200 Ω 100 Ω = R  R R1=R+RR R=200+200200 200=100 Ω
R8=120 Ω R8 = x+Rx R R8 x+R8 R=x R=300 200=0  x=RR8R8 R=200120120 200=300 Ω x = R + R1  Ω  R2=x+Rx R=300+200300 200 Ω=120 Ω

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