__Resistors connected in series__: - If the number of resistance are connected one after another in such a way that the same current flows through each resistance, then the arrangement is called resistance in series.

LetR
be their effective resistance in the circuit.

_{1, }R_{2 }and R_{3 }are three resistances connected in a series combination and let
Let V

_{1, }V_{2 }and V_{3}be the P.D. across resistances R_{1, }R_{2 }and R_{3 }respectively. Let ‘V’ be the P.D. of the cell. Let ‘I’ be the current flow through each resistance.
According to
Ohm’s Law,

**If the resistors are connected in series then.**

__Conclusion:__
i.
In
a circuit the current is the same in every part of the circuit.

ii.
The
resistance of the combination of resistors is equal to the sum of the
individual resistors.

iii.
The
total voltage across the combination is equal to the sum of the voltage drop
across the separate resistors.

iv.
The
effective resistance in a series combination is greater than the individual
resistances.

v.
This
combination is used to increase resistance in a circuit.

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