Question

Two Identical Resistors (R) Are Connected In Parallel And Then Wired In Series To A 40 Resistor. If The Total Equivalent Resistance Is 55, What Is The Value Of R

Answer 1

Answer:

30 ohms

Explanation:

series resistor value is 40 so the remaining 15ohms is the value of Re of parallel resistors.

now for parallel we have 1/Re=1/R1+1/R2

since both are identical so 1/Re=1/R1+1/R1

now put value of Re and calculate

1/15=2/R1

Apply Cross Multiplication

R1=30 ohms