Q. Which arrangement of $3\,\Omega$ resistors will give a total resistance of $7\,\Omega$ ?
Current Electricity
Solution:
Three resistors of $3\,\Omega$ each in parallel will give $\left(\frac{1}{\frac{1}{3}+\frac{1}{3}+\frac{1}{3}}\right)=1\,\Omega$
$R_{eq}=3+1+3=7\,\Omega$.
