why resistance increases on joining two wires in series and Decreases on joining them in Parallel??
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In a parallel connection the charge flowing from the source when it arrives at a node it has the choice of travelling through any branch.This results in a large number of charges flowing from the source in a unit time.So, the current increases.
From ohm's law we know that ,
V=IR.
The volatge is going to be constant across all branches in a parallel connection.Since , the current is increasing when u increase the branches (i.e connecting more resistances in parallel) .The only way to in which the voltage can remain constant is when resistance decreases. So, that's why resistance decreases.
You might feel that my answer was gross.So, to understand this better consider this anology to a ticket counter.
TICKET COUNTER: imagine yourself and all other people as charges.And, you are waiting at a ticket counter to go somewhere.If the number of ticket counters increased ( the branches )then more no.of people can pass through the ticket counter in a unit time( current increases ) .So, the resistance offered by the ticket counter to your movement decreases ( resistance decreases ).
In my above answer the resistance means the equivalent resistance and not the individual resistances.
From ohm's law we know that ,
V=IR.
The volatge is going to be constant across all branches in a parallel connection.Since , the current is increasing when u increase the branches (i.e connecting more resistances in parallel) .The only way to in which the voltage can remain constant is when resistance decreases. So, that's why resistance decreases.
You might feel that my answer was gross.So, to understand this better consider this anology to a ticket counter.
TICKET COUNTER: imagine yourself and all other people as charges.And, you are waiting at a ticket counter to go somewhere.If the number of ticket counters increased ( the branches )then more no.of people can pass through the ticket counter in a unit time( current increases ) .So, the resistance offered by the ticket counter to your movement decreases ( resistance decreases ).
In my above answer the resistance means the equivalent resistance and not the individual resistances.
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