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When two oppositely charged plates are kept in such a way that they are separated by certain distance. Then an electric field is created in between and a flow of positive charge occurs from positive plate to negative plate to establish a current. This happens due to the difference in the potential between the two plates. The positive plate is at higher potential and the negative plate is at lower potential. If these plates are connected to the corresponding terminals of a circuit then the flow of current continues.
Resistors in series and parallel:
For a series connection of resistors, the currents passing through each resistor is same and the potential difference applied across the series combination will divide between the resistors.
The above circuit is the series connection of three resistors. The resultant resistance of the series connection of resistors is:
Thus, the resultant resistance of a series connection of resistors is equal to the sum of the individual resistance and is always greater than the individual resistances.
For a parallel connection of resistors, the potential differences across the individual resistors are same and the current is divided. An example of a parallel connection of resistors is given as follows:
The resultant resistance of three or more resistors in parallel is given as follows:
Thus the resultant resistance of two or more resistors connected in parallel is always less than the least resistance in the group.
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