Which equation should be used for Kirchoff's Law?

[sachin123]

http://img51.imageshack.us/i/unledbh.jpg/"
http://img51.imageshack.us/i/unledbh.jpg/

please see the above image.
if I is the current from left to right in the circuit,
then
what equation shall I use?

V(BA) = I*R1 +I*R2
or
V(BA)= I*R1 +I*R2 - 5 (counting the emf battery connected)

Thank You.Please explain?

 

[tiny-tim]

hi sachin123!

(try using the X₂ icon just above the Reply box )

voltage is just another name for the difference in electric potential (p.d.) …

so the potential difference from A to B is the sum of the potential differences across all sections of AB …

so yes, you must add the p.d.s across all the components

 

[sachin123]

Thank YOU tiny_tim