Question

two colums are connect in series have a resistence of 18 ohm and 4 ohm find the view of equall reistance​

Answer 1

Answer:

equal resistance = 22ohm

Answer 2

Answer:

The formulas for series resistors is: R1+R2=Rs, and for parallel: R1*R2/(R1+R2)=R. So Rs=18 and R1*R2/18=4. Also R2=18-R1 and R1*R2=72. Combine terms and R1(18-R1)=72. Multiply by -1 and collect terms and you get R1^2–18R1+72=0. Then apply the quadratic formula (which I assume you have memorized, if not, then solve by completing the squares) and you get 6 and 12 ohms.

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