Explanation:
A system of resistors can be arranged in two ways i.e. series combination and parallel combination.
In series combination of resistors, the current flowing across each and every resistor is same while the potential difference divides. The equivalent resistance in series combination is given by :
[tex]R_{eq}=R_1+R_2+.......+R_n[/tex]
In parallel combination of resistors, the potential difference across each and every resistor is same while the current divides. The equivalent resistance is parallel combination is given by :
[tex]\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+.........+\dfrac{1}{R_n}[/tex]