Question

Calculate the resistance value if there are two resistance with one of them having 10 ohms and the second as an unknown where the total resistance is 15 Ohms

Answer 1

Gives

$R_1=10\Omega$

R₂=?

$R_{net}=15\Omega$

Series combination

$R_{net}=R_1+R_2$

Put value

$15=10+R_2$

$R_2=5\Omega$