![]() Derivation of mathematical expression of resistances in series combination:. ![]() are combined in series, then the equivalent resistance (R) is given by, Law of combination of resistances in series: The law of combination of resistances in series states that when a number of resistances are connected in series, their equivalent resistance is equal to the sum of the individual resistances.When a series combination of resistances is connected to a battery, the same current (I) flows through each of them. When two or more resistances are joined end-to-end so that the same current flows through each of them, they are said to be connected in series.(c) The sum of the potential difference across each resistor is equal to the total potential difference of the source. (b) The potential difference across each resistor depends directly on its resistance. (a) The current passing through each resistor is the same. There are three important characteristics in a series circuit:.The Effective Resistance of Resistors Connected in Series How do you calculate the total resistance of a series circuit?
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