Question

Contrast series and parallel circuits in terms of what they look like and how they calculate Equivalent resistance

Answer 1

In a series circuit the current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component.

In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.

Answer 2

Let's see

For series connection

$\\ \rm\Rrightarrow R_{eq}=R_1+R_2+R_3\dots$

For parallel connection

$\\ \rm\Rrightarrow \dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\dots$