Question

:

In a parallel circuit, has three branches if one branch of circuit is shot ....what willbe the current :

increase or decrease....with logical answer.

Answer 1

Let's consider 2 cases.
1. the parallel network is connected to constant current source . with current value = I.
2. the parallel network is connected to a voltage source.

Case1.
In this case even if you remove one branch of the parallel network the total current flowing through the entire network remains constant . ( because it's connected to a constant current source) however current flowing through each branch will increase so that the net current value is a constant.

Case 2.
when connected to a voltage source the current value will decrease when one branch is removed, it can be seen as follows:
Voltage across each branch = V
let Ri be the resistance of branch i of the network then by Ohms law current through each branch = V/Ri
so net current I through network is :
I= V/R1+V/R2+V/R3.......
as it can be seen now when one branch is removed the new current value will be less than I

Hope it helps

Answer 2

the current easily flows through the shorted branch as it has least resistance and the output current at the junction of branches is same as that of input current....