Which condition we use kvl and kcl therom .and also tell that about super mesh

 

Use KVL is summing voltages around a loop appears to be useful.

Use KCL if summing currents at a node appears to be useful.

Use a supermesh to enclose two (or more) meshes when you have a common branch within the supermesh for which you know the current relationships between the meshes but not the voltage across the branch. A current source in the common branch a common case where this might be true.

 

This is more of a electronics problem, and we have a forum for that, so I moved this thread to a better location.