The current through a single resistor

**across which there is a potential difference***R***is given by Ohm’s law***V***. Resistors are sometimes joined together and there are simple rules for calculation of equivalent resistance of such combination.***I = V/R*
Two resistors are said to be in series if only one of their end
points is joined.

Consider two resistors

**and***R*_{1}**in series. The charge which leaves***R*_{2}*R*_{1}_{ }must be entering**. Since current measures the rate of flow of charge, this means that the same current I flows through R***R*_{2}_{1}and R^{2}. By Ohm’s law:
Potential difference across

**, and Potential difference across***R*_{1}= V_{1}= I R_{1}*R*_{2}= V_{2}= I R_{2}.
The potential difference

**across the combination is***V***Hence,***V*_{1}+V_{2}.*V = V*_{1}+ V_{2}= I (R_{1}+ R_{2}).
This is as if the combination had an equivalent resistance

**which by Ohm’s law is***R*_{eq},

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