Explain series combination of resistors.

Dear Student,
In a series combination the electric components are connected end to end along a same line. It is such that the value of current in a series circuit remains same.
• There is no branching of current.
• Batteries are connected in series to provide large value of voltage.
• The net resistance in a series circuit is the sum of the individual resistance and is thus greater compared to parallel combination.

Now, if R₁, R₂ and R₃ are connected in series, as shown below

the effective resistance will be

R = R₁ + R₂ + R₃
Regards