When two or more resistances are joined end-to-end so that the output current of the first resistance is the input current of the second resistance and the output current of the second resistance is the input current of the third resistance, and so on, then this circuit combination is known as the series combination of resistances. The equivalent resistance for a series combination of resistances is greater than all individual resistance connected in the circuit, whereas the equivalent resistance for a parallel combination of resistance is less than the smallest resistance connected in the circuit. If we can replace the combination of two or more resistances connected between two points in an electric circuit by a single resistance such that both the voltage across two points and the current flowing between these two points remain unaltered, then that single resistance is the equivalent resistance of the combination of the resistances. When the resistance of a combination is to be increased, we connect resistances in series, and when the resistance of the combination is to be decreased, we connect the resistances in parallel. There are two types of combinations of resistances namely, the series combination of resistances and parallel combination of resistances. Sometimes to get a desired value of resistance in a circuit, we combine two or more resistances together.
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