In this theory, the
difference between series connection and parallel connection of resistor is
given.
Comparison
Between Series & Parallel Connection of Resistors
Series
connection of Resistors

Parallel
connection of resistors

The resistors are connected between two point is
such that the current flowing through each resistor is same.

The resistors are connected between two point is
such that the voltage drop across each resistor remains same.

Current flows through single path.

Current flows through more than single path

Total voltage drop across resistors is equal to sum
of voltage drop of each resistor.
V = V_{1} + V_{2} + ….. + V_{n}

Total current through circuit is equal to sum of all
current flows through each resistor.
I = i_{1} + i_{2} + ……. + i_{n}

The equivalent resistance of series circuit is equal
to sum of all individual resistors.
R = R_{1} + R_{2} + ….. + R_{n}

The reciprocal of the equivalent resistance of
parallel circuit is equal to the sum of the reciprocal of the resistances of
the individual resistors.
1 / R = 1 / R_{1} + 1 / R_{2} + …..
+ 1 / R_{n}

Equivalent resistance of series circuit is equal to
greater than the largest of all individual resistances.

Equivalent resistance of parallel circuit is equal
to the smaller than the smallest of all individual resistances.

As the resistors are connected in series, total current
in the series circuit decreases.

As the resistors are connected in parallel, total current
in the parallel circuit increases.

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